Can this mirror be hung horizontally?
I would like to use it as a bathroom mirror above a counter.
Yes, it can be hung horizontally. Just be sure to measure for each hanger as they may not be exactly level. (As instructed, do not use a wire to hang this mirror as the frame will warp.) I used it above a sink and it worked out perfectly other than it should have been a little lower, but it's better too high as some people in our household are tall.