W212 4gauge power cable direct to battery?

[cfoster]

hi all, I have decided to fit my JL Audio sub / Rockford Fosgate amp into my 2010 E350 (W212). I have a line out converter which also gives me a remote turn on so will figure out what wires I need to tap into when needed, what I would like to know for now is whereabouts through the bulkhead I can get my 4gauge power cable to through (battery in front)? I have removed the plastic cover from under the glovebox and can get pretty close but unable to find anywhere obvious. I did however find this power output to the side (pic below). Would this suffice as a perm.feed? (30amp). Or is there a feed at the back I can tap into?



Thanks