Here's how I've stored different sized rulers in my sewing room. The larger ones hang on the wall with 3M Command hooks, the smaller square ones are in the ruler rack on the left side of my cutting table and the triangles and other odd sized ones are in the basket on the table. I keep the 18 and 24" rulers hung on the side of the bookcase to my right.
Hope this helps,
Cutting table and ruler storage
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