Why not cut some rails and secure them to the underside of the playfield? That way the board is braced and then they can be hung on the wall. You can even add christmas lights for a fancy display.
Or screw them to the ceiling joists in your basement.
(not my pics, but you get the idea)
40130281144b1819391ad1ece1a05f470a4ab796 (resized).jpg538f3173aee2597056fcf9a56073fd5e9da5c357 (resized).jpgd994a6d0bd100524c0e9254f0571ea8a4e5b45a8 (resized).jpg