Hello Akiko! I believe your notion of getting just one unit and find out initial if they all get used to the Litter Robotic it’s a very good solution. Then, if you see them all using it, you can purchase a 2nd 1. 1 one device received’t be enough to https://gregoryouycg.full-design.com/a-simple-key-for-petkit-review-unveiled-79017957