I'm a big fan of tanks that allow side access rather than only top access. Maybe it's me, but I'm uncomfortable (and I'm sure the snake is too) having a giant hand swoop down from the sky. We currently have 2 exoterras, they're excellent. You could always go with a tub as well, wayyyy cheaper, but it sounds like you want a naturalistic display.
My balls don't really burrow. Closest I'll get is wedging behind the water dish lol. But yours might be different, so it doesn't hurt to try. Worst case, your corn gets an extra burrow out of the deal
The live plant is more for your benefit than the snake. Balls are kinda chunky, so unless you have a sturdy tree or a stunted snake, everything will most likely get crushed. We had a little on in there for awhile, but my boy likes to redecorate his tank A LOT and it didn't last long lol.