I'm pretty sure Vin Russo uses tubs with his Boas. They are huge and not very cheap. I think the Vision Boa racks are
Around $1500
I would say you can keep them in tubs when they are smaller but will get to big for a normal size rack when adults.

I'm pretty sure the males stay smaller in both. Surinames are pretty high on my want list. I don't know much about Nics but I would take one of those too