Big thank you to Anna for all your help in figuring out this system. Anna suggested cotton mats as being a material cats won’t pee on. I also sprayed them with vinegar.
After almost three years I finally have a solution to make my house not smell of cat pee and to have a welcoming back door. Thanks also to Monique for the shoe rack and for Leanne to introducing me to broom grabbers. This all means a huge deal to me.