I have a long history of using the Solid Tech 'Feet of Silence' and have struggled to find anything to Supersede them in use. The 'FoS' have superseded all footers I have used in the Past under a TT Source and have proved very good under other devices when used as the Footer as well.
Where the 'FoS' becomes extremely attractive, is when used in conjunction with a Plinth or Sub-Plinth that has the Board Material produced from a Phenolic Resin Impregnated Densified Wood.
I can only but recommend the introduction of this Material to be used as the Board to produce the Shelves on the Solid Tech Rack System. Trying one as the Shelve for the Source will be a very good place to commence having the experience.