Hi I haven't tried a Gingko...but did have several Symposium Ultras with my former system and used one nearly always with my SME 20/2 Table. The symosium ultra shelves always improved any gear I tried with it. Lowers the noise floor, increases the details, but in a very natural way...
I do think they require a hard interface between the component and teh shelf, so any kind of squishy feet isn't optimal. I doubt it will sound bad...just not optimal for their product to perform it's best...
Suteetat-any hard cone/foot under your TW should work just fine...my former SME 20/2 stock feet was ball bearing interface to the turntable...worked fantastic...