I installed a flip down monitor in my Mom's Bravada this weekend and found that the headliner was flimsy and sagging behind the sunroof. So I bought a U-nut and slipped it onto the sheetmetal between the headliner and the sunroof.
Then I drilled a corresponding hole in the headliner and used a 3/4" long screw with a black screw cap to secure it.
I think it looks pretty good, compared to the alternative.