We have 4 and two litterboxes. No issues with them doing their thing. I have had it recommended we need more litterboxes, but since there are no issues, I don’t really see the point. That being said, we religiously clean those twice a day, so I suppose that helps. And on the point of 4 cats, I agree, it’s a bit much. We had two and then last year we found two kittens on the street (not at the same time), one scroungy as hell and the other one had a gaping wound. We nursed both back to health and then didn’t have the heart to give them away, so yea, that’s how that went.