I use velcro for mine, and I've found is I need to get to the spare wheel (where the widow make is lol) I can push my sub back at a slant by moving the back seats forward. However in the summer, I do intend on doing some sort of boot build. Originally was going to fill the spare wheel well with fibreglass and put the sub in the, but think what I'll do now is used the left and right hand sides instead, with sub and amp in each.