I have two windows in my apartment bedroom. One is straight across and just needed a tension rod (also from Umbra, also excellent); the other couldn’t support a tension rod because the window was at an obtuse angle to the wall. I couldn’t use ceiling mounts because of popcorn ceilings, and I had begun to lose hope that I would be able to hang blackout curtains. Then I found this Umbra product. It was easy to set up and has held up my blackout curtains with no problem for over a month now. I’m so happy I made this purchase, and I only wish I’d known about it sooner!