I received my Birds Choice-The Great Hangup Super Strong Window Hook a few days ago. It’s good sized, close to a foot tall, it has 2 strong suction cups on it. It can be attached to your window with the hook either up or down. It is strong and sturdy.  I’ve ever had much luck with suction cups sticking to things and staying but so far I love this hook as it has stayed right in place. I am very happy with it.