I use those wooden ones made with slat like things for holding my rulers (sorry can't remember the name)....they just sit on a shelf or table depending on the size of my rulers. Used to be they were expensive but now you can find them at reasonable prices. Depending on the size/s you purchase you can get a lot of rulers on one of them. I sort them by sizes and think I have four of them. I don't have much wall space because it is all taken up with shelves and pictures of vintage sewing items.