I have an idea for ya. Why not cut a piece of the non slip rubber to fit bottom of coaster and glue in on. That was coaster would stay put. Just a thought.

supposed to be cork side down, but have you seen the ones that are completely cork?
I agree with kb you should use some of that spongy plastic stuff that is non-slip. Or the home improvement store also sells little round plastic “feet” get the really thin flat ones, they have adhesive and stick. should work

You could also glue on felt!

I suggest you get a brand new desk…lol

I use thirstystone coasters and love them. They come in all different colors and designs. They are a porous stone with cork on the back side. I have used them on glass, wood and formica with not problems with sliding. What is really nice about these is that the stone absorbs any moisture so your glass isn’t sitting in the condensation causing it to either suction or slide.

I also have had great luck with leather coasters. Again, they don’t slide and they absorb moisture wonderfully. They do eventually curl from the absorbing and drying but that seems to take a while.

I found this and a few other designs in Goldies Garden Spin booth

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Montrose would the small round rubber bumpers work like the ones I place on the glass coasters I make? May be a simple solution.