Hello there Akiko! I do think your idea of obtaining one particular device and find out to start with if all of them become accustomed to the Litter Robotic it’s a superb technique. Then, if the thing is all of them using it, you can purchase a second 1. A https://robotic-pet-cleaning00098.thenerdsblog.com/42937637/the-basic-principles-of-petkit-purobot-uae