Headliner screw clearance
 

Howdy from Oregon where we kiss where the sun don't shine (on account of the incessant rain)
Strayhound (my van) is a 1998 E150 Club Chateau window van.
I'm looking to mount my venerable old CB radio centered on the ceiling as I did on my '81 E150. Is there some sort of membrane that I'd be screwing into?
Or, am I better off using molly screws? Please advise.

Thanks and a lift of the lynch lid

Gus