Here is a set of hexagon shelves that you can mount to your wall to make your home pet friendly. The Hexagon Wall Mounted Cat Tree is available in 6 colors. It is made of wood with paint and varnish that are hypoallergenic and cat safe.
Each shelf measures 16.9 x 19.3 x 10.4. They have 7.5 x 6.9″ round steps.