Ground points in trunk

[lobf]

I’m installing an amplifier in the trunk, and I’m looking for convenient grounding locations. I’ve searched other topics but they’re missing photos, or are otherwise a bit unclear to me. 
 

in one, it was recommended to ground to the trunk hinge, which is located perfectly for me. However, the bolt that the hinge goes over in the trunk seems to be attached to the car. See attached photo. Does this bolt come out so I can ground to the back of it? 
 

Any other ground points for an amplifier back here? 
 

thank you!! 

[ray_]

Well you could drill a hole and...\

 

Also the taillights have a ground stud. Go find it.

 

Cheers,

[Healey3000]

If you don't mind having a short run for the ground wire, you could use the seat belt anchor bolts under the rear seat.  Very solid (11 mm), nothing moves, and well protected; plus, cosmetically cleaner.

[SydneyTii]

Drill the panel behind the back seat, drill the floor between the shock towers, you could even drill the shock towers but you’d be in trouble then?

The guys with the rear battery mounts have good pics of where they grounded.

[Chris_B]

There is a ground point under the trunk panels where the taillights are grounded. This doesn't look particularly robust to me. I installed my amps under my back seat and put a ring connector under one of the upper back seat lower mounting points (does that make sense?). Sorry, don't have a pic.