Here's a cool DIY idea for a cat enrichment toy. Glue together a group of toilet paper rolls inside a tissue box and randomly fill the tubes with treats. Your cat will be stimulated when they "hunt" for a treat. So simple and inexpensive.
Not sure about mounting up high but a cute idea. "A diy cat project so easy even the laziest of pinners can do it TONIGHT in less than 10 minutes! Wicker basket + folded up blanket = BOOM! Instant private kitty oasis perfect for escaping annoying humans"