Haha yeah my GF is super pumped. After multiple long trips of setting up and breaking down a ground tent/sleeping pads/bags etc... it is going to be well worth it I think. I went with this one due to the size it is when deployed and the upgraded pull straps that bring in the fabric on the sides...
Heres a couple photos. After you route it through that rubber grommet you can pull the headliner down slightly and guide the cable down to the left to the jack compartment.
You can use turnbuckles to secure it to the factory tie down rings. I never secured it though. I used MDF for the top platform so its super heavy and fits in pretty secure. No rattling or movement issues on or offroad at all.
Honestly the easiest and cheapest way is to just make something yourself. I'm no carpenter but it only took me a weekend to build this rear platform and it has held up perfectly.
Measurements are roughly 43.25" Wide x 39" Deep x 3" Tall
Yeah should be easy enough to just cover the connecter if you're worried about it, I don't really see how mounting it vertical is really much better either way.