That size is fine for most adults. For a hatchling or juvie you should clutter it up to make them feel secure.
I've never seen a RHP in a tank before. I read one post by someone concerning a tank RHP, but I could not find it available at Reptile Basics as indicated. Regardless, is it better than an UTH? I don't know. There are a lot of UTH advocates here. For the safety of the snake, the key with either is to have them regulated with a quality Thermostat, a MUST!
For humidity, I found my success experimenting with subtrates and proper covers over the screen.
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