Buy a Scat Mat; it will break the cats’ countertop habit.
Looked it up on Amazon. What a great idea, hon! I've been catless for a few years after continuous cat ownership for decades. I used to spray cat repellent on paper towels and lay them on the sofa or safety pin them to the legs of upholstered furniture, but the Scat Mat would lay in place and is less smelly!
As for tabletops and counters, that was always a very loud “NO!! BAD!! clap clap clap” with no exceptions. But our friend above with dogs as well as cats probably finds the separate species' eating areas very useful.