Hey y’all, I’m trying to figure out the correct orientation for some shelf brackets for those wall cat trees. The brackets themselves are asymmetrical like a real ‘L’ with a diagonal brace. My question is, should the long side be under the shelf or against the wall?

I’ve done some searching and am finding mixed answers and even did some testing with my actual cats on the shelves. Results were inconclusive so I was hoping someone would have an more educated answer. I appreciate your help.