if you can fashion an airtight duct from the humidifier to the terrarium, you should be ok, even if the actual humidifier is on top. after all, the water has to go somewhere...
that said, I'd still recommend the duct enter at the bottom of the terrarium if possible. kinda like a big u-shape.
I dunno, it sounds feasible in my mind. but I could be totally wrong.
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