If you're concerned about the legs digging into the cabinet as you nudge, I'd recommend some leg spacers like these from Marco: https://www.marcospecialties.com/pinball-parts/535-0599-00
These will have the leg floating just in front the cabinet so they won't touch it as much. I'd say a protector like this is especially important if your games are on carpet, since a powerful nudge will cause the legs to bend a bit instead of slide.
With that said, all you have to worry about is cosmetic damage. You don't need to worry about nudging causing structural damage to the game.
