Product review (5 stars): Perfect!
I looked a lot before settling on this one, it was the adhesive backing that sold me on this. I wanted something that I could put right at the top so it was easy to see. I was also worried a magnetic one would fall off. At first it seemed a little difficult to slide but then I realized I just needed to push down a bit and it slides perfectly. I like that feature because I know it won't just slide over with day to day use.