Grounding location for amp in 89 hatch

Lift up the carpet in hatch area so you can get to the pan. This is where my system is grounded. I sanded off an area and drilled hole for the screw. Then attached a ring terminal to the ground wire to be attached with the screw. You can even use a screw with a star washer or something like that to make sure it stays fastened, but as long as you don't overdrill your hole, you should be fine. The most important thing is to get a good bare metal ground. Some people even paint over the spot once screwed in. Hope this helps.