Here's an idea I tried yesterday, which turned out ok so thought I'd share. The rack holds 18 pair of shoes so theoretically will accommodate 36 holsters. I currently have 19 on mine but no shoes. Sorry, no pics but will try to post one later.
Here's a Walmart link to the item to give you an idea. The online price is more than my local WM price ($8.97) was so shop around if it's something you might be interested in.
https://www.walmart.com/ip/Mainstays-Shoe-Rack/15566862