I have been looking for this solution for years!!! I can't believe I didn't come up with it myself. They work great. I use them when I'm on extended stays at work or at a hotel. I did add a couple finishing nails (both sides) to my own door frame moldings just to be sure, but I hadn't seen any issues before that. In short, I love these. Usually, you sacrifice practicality/functionality for convenience, but with these you have the rare occurrence when you get both. Instead of them being an alternative to my power tower, they are the preferred. I cannot overemphasize that these are a definite buy. They don't come off the door frame, they are heavy built, light weight, and super portable. And you can adjust the width easily within the door frame width. Get some and enjoy!