Most of the cat-proof systems are tested! I'm sure there is a cat or two who may have escaped. If your garden is fenced in, it is much easier to place something on top. I've just discovered the roller system but have not researched it. Other cat proofing is to add fencing at the top that pivots so that if the cat gets up there, the cat is gently dropped back down to the ground. I'm sure there are cat owners who have wired or put netting across the sky of their garden. It will attract leaves, branches, etc. that will need to be cleaned.
We would love to see what you eventually come up with.
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