My daughter has asked me to install a sub and amp into her 2007 Cobalt. I plan to install the amp in the trunk, but the sub box is such that there is no way to get all four mounting tabs of the amp (Sony XM-ZR1252) onto the box. I am looking for an alternate location to mount the amp that won't be too much in the way of using what's left of the trunk. What have others here done? I'd rather not fasten it to the back of the folding seats, either, although I have seen that done in another post.