Love silicon spray just be careful not to spray it near any floor that might be slick (my robotics team only made that mistake once, remember the Charmin commercial with the dog sliding into cabinets? Think people. Stuff didn't come off those floors for weeks. We learned to walk very carefully around the lab space for a while.) Teflon feet are good. If you don't want to spend the money, maybe try testing some tissue paper between the foot and the vinyl. I found roller feet left marks depending on the thickness of the vinyl I tried to use.
This reminds me, I've got a bunch of the stuff in the closet somewhere that needs a project. Darn it, now I have to go play.