Where to Bolt Speaker boxes in boot?

[ectraz]

ive just made some nice 6x9 Speaker boxes, trying to find somewere to bolt them at the back out of the way preferably to the roof any ideas how to do this?, i was going to cut tidy little holes in the roof apolstry, and use liquid metal to stick some brackets to the roof then bolt the boxes to them but not sure i want to perminenty scar the vehicle

[jeff.fn02jwa]

i get good sound from my standard speakers but what do i know but i would not go cutting in to the head cover