Coupe now being broken for parts
You know the one
Up to you really. I tend to do it one of three ways:
1) like toms has suggested
2) all back to the battery earth point
3) one earth point in the front, one in the rear.
Just ensure that your power cable from the battery is the same size as the earth cable into the earth point. So 0AWG from the battery can be split into say 4AWG to the amps but when you run the 4AWG earth into the unfused distro, the cable from their should be 0AWG