With that many cats, it would probably be better if the walls were tiled, or easily washed. You'll need quite a few litter boxes, and probably already have them, some kitty condos, high resting places, and toys. Some people (with money) put all sorts of walkways and tunnels high up in the room, because cats like to be high in the room. It depends on how much you have to spend. It might be nice (if you can afford it) to build a very large enclosure with a screened top outside-with a kitty door to access it. You could prop dead tree limbs against the sides for them to climb and other toys to chase. They would love that!
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A dog, I have always said, is prose; a cat is a poem. ~Jean Burden