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You could use a lot other material in that case. The concrete itself is a non-sequitur, your isolating the base with another base with rubber between both. Concrete, wood, plastic. Anything at that point between the two rubber pieces.
It's just better if it's more massive.
That’s a good point, I wonder if at this scale it’s negligible or not though.
Massive, won't melt, won't catch fire. Ceramic tiles would work just as well imho, though a tad lighter (which might actually be good, given the thickness of that shelf)