We use one similar To the tommee topper one but ours velcos to the window, we used black out blinds but they weren’t blacking out Enough so use that too! On Amazon it’s called temporary black out blind, was £17 and can cut to size!
We’re currently using the Tommee tippee one you stick to the window but it’s annoying for long term so going to look at getting bloc blinds for when she moves to her own room as a few people have recommended them. Not cheap but worth it if it means more sleep!!