I later taped up the positive pole on the back of the relay panel.
I went ahead and ran 5 wires out through the firewall for my outputs, I don't have anything to actually hook up yet, but I bundled the wires behind the battery. the wires are not actually connected to the output of the relay panel yet, otherwise they would be safely taped off to not touch ground.
Note the fuse at the battery on the 8 gauge power wire.* I used a fuse for now, will switch it out for a circuit breaker later, added 50 Amp Circuit breaker to list from waytekwire in post #1
Here is where I grounded mine- passenger side kickpanel- there are 2 stock ground bolts there-
And here is an example that SaddleTramp showed me- on 2012 or newer, you should have a hole in the firewall, that you could run your cables through.
I am going to check if that hole is there on older jk's. Edit- just found on my 07, so I am guessing all jk's should have this hole. It is behind the wire loom above the battery. Thanks SaddleTramp and Will!