A sisal scratching post from SmartCat that works either standing up or lying flat, which is the point of the design: cats have a strong individual preference for vertical or horizontal scratching, and this one covers both while you find out which yours is.
Sisal is the surface most cats prefer over carpet, and unlike carpet it does not teach the cat that floor covering is fair game.
Getting a cat to use it
Place it where the cat already scratches — next to the sofa arm, not in a spare room. Catnip on the surface helps for the first few days. Once the habit moves across, you can shift the post gradually.
See also the Ultimate Heavy-Duty post and the Sky Climber. Browse all cat scratchers.