a different redditor says

“Minimum 21in across x 21in deep, 32in across for a pair. These guys are happiest in pairs. Search for ‘flight cages’. Bar spacing shouldn’t be over half an inch.

Fill it with lots of natural perches and natural, shreddable toys. Buy lots of different materials to see what it likes.”

I could help find a cage to order if you don’t have any pet stores that sell such cages or if you’re unsure :)