Phoenix Gold Amp>>>> this is the exact amp I purchased. All in 1 solution @ 5 channels, not cheap at $850.00 retail.. It is mounted behind the seat...again a board was mounted against the wall UNDER the carpet. The amp is thin as you can see...and just requires 1 click forward on the seat to avoid contact on the passenger seat and allow for good cooling.
I went all Phoenix Gold...except my head unit, Pioneer 8100
TI21600.5 - 1600 Watt 5 Channel Amplifier - Phoenix Gold