Amp mounting location

SouthArk370Z

That panel seems pretty substantial to me. Use a backing plate of some sort (Al should work well, also) that is glued to the plastic (rubber cement?) and make sure the amp is secured to the plate. Should stay put in any wreck that you would live through if you do it right. You might want to add some screws/washers (wrinkle finish black paint should blend in well) around the edge of the plate to further secure the plate, keep it in contact with the glue, and help spread the load.

Edit: I would avoid mounting an amp near the floor and behind the seat. Too easy to block air flow. YMMV

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