I wonder if you got some plastic mesh (google on "Deer Fencing"), about 1"-square, and put it on the front side of your Maggies, PLUS got the scratching post mentioned above, whether that would do the trick. Rub some cat nip on the post. The deer fencing is black, so it may not even be noticeable. Get it at a mesh size and toughness that the cats will not like. Use plastic rather than metal - I'd guess - due tot he magnets in the Maggies? Anyhow, after a while, once the cats prefer the post, you may be able to remove it entirely.