Well I mounted mine on the back of the rear seat in the trunk so in the summer time I can pop the seat down to allow it to cool properly....
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i got a small wall that has an amp on the back of the sub box so when you fold the seats down the amp is right there, easy to adjust. There is perfect amount of room.
Generally rule is to mount with nuff air to cool, or, you can mount it whereever the hell u want if you have nuff cool air blowing in with fans to cool it off and dissipate the heat. I think ground from amp should be no more than like 3 feet optimally so look for good grounding spot first.