Tons of good advice in the thread. “Dogs have owners. Cats have staff” :D.
On the scratching post: There are better commercial ones out there than when we last looked for a store-bought one. Used to be, they were low (maybe 2 feet tall) and on a flimsy base that pulled over onto the cat as soon as the cat would get to playing with the thing. This would occur perhaps twice and the cat would have nothing further to do with it. Oh, and they were often covered in pile carpeting - i.e. something the cats claws just barely caught on, so they didn’t get a good stretch. Newer commercial ones often have the vertical bit wrapped in rope, which is a better stretching medium, just thought I’d alert you to look for the covering.
When we last shared quarters with cats, Typo Knig actually made several posts using closed-loop pile carpeting, a 4x4 post (about 3+ feet tall) for the vertical bit, on a 3x3 foot square of plywood for the base. Those were GREAT. If you know anyone who’s remotely handy and would be willing to invest an hour or two to make one for you, the cat will be very pleased. One of ours liked to climb up the post and perch with all 4 paws on the 4x4 bit, like a circus cat. IIRC, we had to recover the vertical bit after a year or two because the cat had shredded it.
Cats have been known to get up to mischief for the sheer hell of it. I had a plant stand with little round shelves on it. Nothing fancy. I had some plants on it. I would come home from work to find them knocked down. OK, cats bounce around and don’t bother avoiding obstacles if they don’t feel like it. Until the day I saw the cat sitting next to the stand, raising one paw, and DELIBERATELY pushing the plant off the shelf.