My schefflera lived in the concrete mixing tube catch basin of the misting system along with the pothos and hibiscus. It was fine living in 1" of water its whole life. no root rot in the pot.
Im all for having a "pet tree" and its hard to find the cham. As Beman said you dont want to block the uvb basking. And depending on your climate, too many plants + lots of misting = mold/fungus in the areas that dont dry out between mistings.