The greatest Leo substrate, learned after 12 years, is actually slate tile. It spreads the heat well while not getting super hot, there's nothing to ingest, it's fairly easy to clean and it's relatively cheap.
Just make sure the tile is 'rough'. The glazed stuff is too slippery.
As for those drawer things... unless you used back heat I don't really think they would work out too well. Also, many of those units are a bit flimsy. You could try it, tho.
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