Actually, I do keep them up there! The grail and stones have a little piece of velcro that keep them up there and the ark is plenty heavy to not go anywhere. They are really the ultimate toppers for that game.
Indiana Jones: The Pinball Adventure
Picked this up a couple of months ago. Super fun and great call outs from the first three movies. It even came with some collectible toppers like the Sideshow Collectibles Ark of the Covenant movie prop.