It was the only one I could find in black that would support both of them...as long as it is braced against the corner. He could knock it over otherwise. It's heavy duty, but so is Jem. I am thinking about ordering another one once the sunroom is finished. Oh, yeah, the floor is going down in the sunroom in a week or so. That's a story for another post.
Anyway, cats are no longer tree-less, because they get what they want.