I think I found the best place on the V2, which is the triangular upper cross brace on the back window. It works super well from inside and out, and it’s easy to find in any weather or lighting conditions. Pure muscle memory. It’s also possible to reach it easily from the tent with one of the floor panels removed.
Here’s my post on lighting. I don’t think my homebrew buckpuck driver setup is the right thing for most users, but you can read/see my thinking about everything including dimming, switch placement, quality of light, etc.