Floodlights on roof of vehicle make it too bright to sleep inside

While I’m at it, do these things also still need to be on the outer edge of a vehicle to light anything?

I think you can install one practically anywhere. In my own vehicle config, the spotlight sits on the roof of the cab, about 2-3 spaces in from the edge, depending on where you measure from. As to the light keeping you awake, why would you want to leave a spotlight on in the first place? Beside battery drain, you also have the fact that you’ve got a rather obvious beacon pointing out your general location. If you really need to have it on while you sleep, you’re going to need to compartmentalize your vehicle so your sleeping space can be blocked off by doors (and thereby block the light).