Patience and trial
Bought it in good faith and thought you’d just stick it straight onto the window.
After it kept falling off again and again, we were about to leave a 1 star review because it just didn’t make sense. Then we found out you actually need to wash the suction cups in hot water first. And give the window a proper clean. And here’s a good tip: try things out for yourself, because it seems like the two cups we put at the top are the ones that hold the weight best, the ones underneath don’t hold as well. Patience. 😇 And now the cat sunbathes every day.