I have two in my greenhouse. Pardon the poor photos, I was too lazy to shut the foggers off and wait for it to dissipate...
One is growing on a double H shaped trellis made out of 2x4s. I can add more rungs to it as needed.

The other is growing up a concrete "tree" that contains the nest boxes for my little parrots.

The plants don't seem to care, as long as they can adhere their roots to it. I have huge masses of roots going down both and into the ground. If you zoom in on the tree pic you can see the aerial roots climbing down down the tree, and it is just painted concrete.
I think the important thing is that you can walk all the way around the trellis, and reach the top for hand pollination. I have missed blooms because they are sort of yellowish-green and blend in with the foliage and I didn't see them.
Cheers, Carolyn