In an attempt to keep them from scratching the sofas, and in an attempt to remove the bubble wrap from the most tempting scratch areas of the sofas, we bought two of those cardboard-catnip-laden scratching thingermajiggies. (I'm sure they have a real name, but heck if I know what it is)
I now have two cats scratching these things simultaneously. And you know what that means? There are ZERO kitties scratching the couch at this moment! Earlier they were fighting over being able to scratch one, until I pointed out that there was a second one so they didn't even have to share.