People are really critical about cat litter box smells, but with 8 cats using litter boxes all day it's almost impossible to never have hints of litter box stink. The smell diff. outweighs the love we receive from all our babies. It takes alittle extra work to maintain boxes but it's not that bad. It's a labor of love but goes along way.
You have wonderful cats. I had the same "problem" when I ended up with 7 cats. Family and friends thought the house would smell now and be dirty....nonsense! We can have a clean house althought there are many cats. Maybe it is a bit more work but that is worth it :)