Here are a few to consider/research, Polycrystal cones inverted, Ceraballs, Feet of Silence, Aurios, Darumas.
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Naim makes a highly regarded shelving system that uses glass shelves as do others. There are many misconceptions in this hobby. "Glass shelves are evil" is one of them.
Unfortunately the best feet for your combination of shelving and equipment can only be determined by trial and error. Buy stuff used so you can resell what doesn't work and have fun experimenting.
My experience has led me to the conclusion that there is no such thing as "the best" isolation device that works well in all systems in all situations. There are just too many variables involved to extrapolate the results from one system to all others. Isolation feet that work well under a turntable on a glass shelf in a rack sitting on a cement basement slab may not sound good at all under a CD player on an MDF shelf in a rack on a joisted floor three flights up in a 150 year old house. Unfortunately there's no substitute for trial and error.