The only way I could get my wall hanging with a rounded top to hang straight was to trace a piece of fabric the shape and size of the top and about 8" long and sewed it to the back like a sleeve. I then cut a piece of cardboard to that size & shape and put it in the sleeve-thingy. I poked a hole thru the sleeve & cardboard and hung it on a nail in the wall. Probably not the best method, but it works well.