Modern Living Window Lounger Billund

I ordered this window perch because I thought it looked nicer than my old one and I wanted to give my cat (6kg) another spot by the window in the flat. The Trixie window perch has held up great for many years. But unfortunately, this perch keeps falling down, taking my cat with it. I've tried everything—using the suction cups dry or damp, cleaning the window beforehand, trying a different window, even a different flat... nothing works. It's such a shame, because I really like the look of the perch.

I had high expectations for the product, since the reviews (even though there were only a few overall) were really good... YES, it's easy to assemble and attach to the window. Even though my cat doesn’t sit on it, it still falls down... Any tips?