Here is our set-up on the rear shell. Z-brackets attached to roof with 3M VHB double sided tape (6x stronger than screws).
no exposed wiring.
Friends don't let friends buy Renogy.
I have 2x 100W solar panels (wired in series) mounted and 2x100W solar panels (in series) on 20' of 10G cable and wired in parallel to the other 2 panels.
As far as mounting the solar controller..... You want ti as close to the batteries as possible. I mounted mine on the lower back, outside the rear storage compartment door. It's protected at all times and stays much cooler.
Conduit for wiring.
https://www.amazon.com/gp/product/B0...A05CNKN2&psc=1