1. put them in one box, a dual chambered one, i have one like that from MTX, with 2 12's and it fits perfectly up against the back seat...

2. turn them around you want them to face the back of the car

3. take a small towle or washcloth and take off your licence plate, place this under your licence plate (fold to make as little show as possible) and put back on, or you can buy a licence place thing from dynomat for like 20 bucks or somthing.

I would dynomat the whole trunk if you dont want rattle they sell kits.

Also you may want to put those speakers back in and just leave them unplugged, with them in your trunk compartment is sealed giving the sub a different sound than if it were open (ever listen to the diff. between subs in a sedan vs. a hatch?)

Any other questions ask