It comes with adhesive strips for damage-free mounting, but you can also choose to install it with screws.
Promising reviews: "Worked great but I needed to buy additional adhesive to get it to stick to the wall. It's good for a cat who feels the need to rub a lot. In fact, if you have that sort of cat, make your life easier and get one of these. You can't train them to stop. I've tried." —R. Noel Burr
"My cat Gambino Bambino would let you brush him bald!!! He loves to be groomed and comes running whenever the brush comes out. Though we love to accommodate, I know he wanted more. He was constantly rubbing his cheeks and ears on the corner of our walls to get even more scratching. I finally came across this product and knew he would love it! It took a little convincing but once he got the hang of it he’s been loving it! We have one in the living room, one in the kitchen, one at the top of the stairs, and one in the guest room! He is having a great time!!! Very easy to put together and place on the wall." —T. Mangiaracina
Get it from Amazon for $4.99.