I have a new e10k and had a couple questions before I build a box for it. I want to fire it down because it is going under my rear seat in a 98 extended cab gmc. Is 1.5" enough clearance between the mounting surface and the floor? Will screws be strong enough to mount it in 3/4" mdf, or do i need to use tnuts? Do I want the screws to grip the rubber around the sub or just the metal underneath? I think that's all the questions I have for now. Thanks for any help.