Yes, having at least one litter box per cat is a great idea. I have 5 cats and 5 litter boxes but they usually only use about 3-4 of them. I also scoop every day and I try to keep at least 2 -3 inches of litter in the boxes so they're able to cover up their waste. I use hard clumping litter and baking soda is also a great idea to sprinkle on top if you still have odor problems. My litter boxes are the covered kind so this also helps with the smell. Good luck.