Other than mounting LCD's in the headrests for the rear passengers, or in the seatback, the ceiling mount is apt for problems, especially in a car, if it was my head that hit the lcd, I would swear a lot and tell you to go someplace not nice if I broke it!

I have never seen the PSone, if it is that small, perhaps it is shockmounted somehow? is there a url where one can pique his interest in such a device?