Drilling Holes in Interior_'99 Crown Vic

Hi!
I have a 1999 Crown Vic, and am preparing to install a small power inverter and a goose-neck phone/portable 2-way radio mount. I have some concerns about drilling holes in the floor-- especially what areas I can and/or shouldn't, and how deep=safe. Preliminarily, I'm thinking under the front passenger seat, and on "the hump" (somewhere).
I've already looked from underneath the car, but that tells me very-little-- not to mention the fact that I still don't know what might lay between the interior carpet, and the bottom o' the vehicle (wires, lines, corpses stowed by the previous owner, etc...) I also recall having an issue w/ not being able to drill-through the top of "the hump" in my '99 Mercury Grand Marquis, while attempting to mount a Streamlight Stinger flashlight charger.

Thanks!
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If this is a county or state vehicle I would ask a mechanic at the garage to do this for you. They probably ought to put it on a lift and seal around the screws to prevent water damage to the floor. They also should know where any wiring is in this vehicle.

Well rhandwor, unfortunately THIS one's my POV; & doesn't belong to the PD-- even though, I suppose the very same municipality did pay for it, TECHNICALLY (via my paycheck[!])
One o' these days, I'll break-down & buy a factory svc manual. Wire-routing info, like what I'm looking for, would be in there, right?..... or do you think I'd have to buy some separate Wiring Manual?

Oh, and thanks for the reminder about sealing around the screws! If I hadn't seen your response before getting that wiring-info & drilling the holes, I would've COMPLETELY forgotten about that (a simple yet VERY important detail, that a manual wouldn't've reminded me to do!)
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Usually if you look at the top of the carpet and move the seat back the carpet ends. You can feel if any thing is in the way.

It's probably too late, but why not just make a mount for your equipment that bolts onto the existing seat track mounts? If you have split bench or buckets, you can just remove 2 nuts, then set the mount in place, and tighten the nuts back down!
The 50 & 30 amp Police feeds should be handy to that area too if they were installed.

Geez... I didn't even think of that at the time.

I've long-since mounted the equipment by just drilling holes & mounting the chargers and inverter that way.

Since the time when I originally posted this, I did some junkyard research-- pulling up floor coverings/carpeting and found that in cars w/ air conditioning, the "hump" usually has a flat duct that splits to direct air under the front seats, for the max-A/C.

My mounting method seems to work well enough for my purposes, but a mount like the one you're talking about would've been better... Oh, well... It's a bit late now-- Thanks for the suggestion, none the less!
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Since my original post, I've been driving a '99 Merc Gr Marquis, & I mounted the chargers & inverter just by drilling the holes. Again, I wish I'dve gotten the bracket idea from ya' beforehand but like I say, my method works well enough, I suppose. As of today, she's got 208,416miles on her!

UNRELATED: The Grand Marquis (which is on the same frame, and has the same engine as the [consumer model] Crown Vic') is my POV, and was my cruiser, when I was Security Enforcement Manager @ Six Flags Over Ga, several years ago, before working for the PD.

My profile pic is of my 1st take-home car from the Police Dep't-- a Dodge Inrepid, which we, less than affectionately called "Decrepit's"... Because they SUCK as patrol vehicles!!! They're simply not designed to do that job. And ESPECIALLI not designed to be fleet vehicles, which sometimes run for a week or more, w/o being turned off even once!-- literally, b/c it's already running from the guy w/ whom you're taking the car, from his shift then you get your car and leave it running for your ENTIRE 12-hr shift-- never shutting it off, even to fuel-up... and you just lock the doors w/ it running when you're out on a call, then just use your remote to unlock it. "12-hour shifts" often turn into 13-- 14-- 15 hours, especially if you're backed-up on reports &/or have court after your shift is SUPPOSED to be over!... When you're done w// the car for the night/day, you just leave it running while you load-out your stuff, and the next guy loads-in, then at the end of HIS shift, it's still runnin' while he and the NEXT guy exchange the car-out... And on and on for neumerous!

Was your Vic' a fleet car before you bought her, or was she somebody's personal take-home? What Dep't was the car w/, before you got it?
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My Vic was a fleet car, it belonged to the Montgomery County (KS) Sheriff's Dept. It was totaled via a deer, then rebuilt and driven by another guy, I bought it from him, and it's still going with 223,125 on the clock now.