A friend of mine gave me a sheet of 15 mm, tri-laminate plastic ( the kind they use on kids playgrounds).
I have made some 10 inches ota rings and a smartphone holder, but when my new mount came this week my wife wasn't on happy with the setup standing on the wood floor.
So I made some floor protectors.
Used a countersunk to put a large dimple in the centre and got some self adhesive felt from bunnings.
With the felt on the bottom I can slide the whole thing around easily.
They might even give a little anti vibration, not tested that yet, have made a second set for outside.