An idea for "anti-slip" additions. A piece of velcro glued or nailed, or both, to the shelving and the other piece on some thin fabric cushioning. I have to admit, I have yet to do this myself with a thin cushioned cover I made for a wide window sill. The cats like it, it's a bit warmer than the bare wood. I made it reversible to formfit over both sides of the sill but once in a while a cat will jump up, catch the cover, and the whole thing falls off. It's not high. I made it that way to be washable but it could stick on better.
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