I drilled holes on the side top of my cutting table just below the table level, put in nuts and long bolts. Now I have a place for my most frequently used rulers.
From one of the bolts hangs a fabric ruler holder. This was made with 3 pockets at different depths and each about 7" wide. So the rulers I absolutely use the most go in there.
My specialty rulers hang on round belt hangers on the side of my bookcase int he studio. My really small rulers, the ones without holes are grouped by size and purpose in a drawer of my IKEA Antonius system.
My Alto's QuiltCut2 lives under the TV armoir in the living room so it is handy to my cutting table.
I have a somewhat small home and peg board would take precious space. The wooden slotted ruler holders take up valuable surface area.
Works for me.
ali