one of my friends has a hatchback fired up. we placed it again, firing towards the trunk. in my opinion, it sounded much better when firing towards the trunk. i haven't worked with hatch cars so i'm not that familiar with firing towards windshield. mount the sub diagonally so it will be firing at a slant towards the windshield and trunk.
I have a suburban i plan on putting 8 12" in it what would be the best placement. facing the back of the truck, firing up towards the roof, or four on the passenger side and for on the driver side. if neither of these then are there any suggestions.