I don’t see why the levels thing wouldn’t work, as long as you got the temps right and have matching hides. Keep in mind that BPs are nocturnal so they aren’t baskers.... Your snake is unlikely to go sit on a slab of rock unless he’s got a place where he can be sheltered and hidden. They will choose security over warmth.
However, what I do is just push some substrate away under the hide so the glass is exposed and they have that hot spot to lay on for digestion.
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