I made a display frame for multiple cats. Take out the backing and you can put cats on both sides. It is modify / copy perms, so you can shrink or enlarge it to your heart's content and it takes up 5 prims on your land.
As you can see, it displays tons of cats. You can make the boxes fit as snugly or, as I do, as an open, floating frame.
Here is market link to it:
https://marketplace.secondlife.com/p/Kittycats-Display-Frame-or-Kittycats-Habitat/6443471