Best way to mount amp? *pics*
Funny thing about the pic you used... I've got my FTRA cover plate sitting on the floor just like the pic... Kinda funny
Drill pilot holes 1-2 sizes smaller than the screws you intend to use. Use the shortest screws possible and be aware of the depth you have going on before you get into outside metal, finish panel, tail lamps... whatever.
Also make sure the screws are painted and if they do punch through to the outiside, get to them on the outside and seal them up with some sealant and/or rust inhibitor.
On my last coupe, I had my amp sitting in the driver's side cubby shown there in the picture. The wiring was oriented outboard/forward and therefore wasn't very visible while standing at the bumper. I just put the hook side of a few strips of self-adhesive velcro on the bottom of the amp and it never shifted or moved around, but it was a pretty small amp like in the picture.
Going through all the effort of an amp rack is only worth it if you intend to show off the system. And showing off a system is really pretty dumb. Keep it cheap, keep it stealth.
Sorry the pics kind of suck but you get the idea, I used I think half inch sheet metal screws and very slowly and carefully screwed it in ( the gas tank is right there!) the screws poke through the other side and left a healthy amount of clearance between the heads of the screws and the gas tank ( at least half an inch) while this does work I dont think I would do it this way again
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Then I have to find a place for the sub amp.
All with a VERY tinted hatch of course! My amp is mounted on a board in the spare tire compartment, out of view. Also mounted the crossovers there.

made it from a simple piece of plywood and some 1x's






just another thought of away to mount the amp. 
