They're easy to place and have a decent size hole for hanging hook, even fatter plastic ones. If you're planning to use them to hold shade or frost cloth, however, it's only possible to place them along panel joint lines but not 45 degree corner joints. This is not a negative review of the hooks themselves but a comment on the limited parts of the frame, they can be inserted into. Yes, shadecloth can easily be placed over non vented sections of the roof. Overall, I totally recommend.

great sevice