This will hold your pliers on their side and save space.

I got annoyed with not finding the right pliers and whipped this up in a couple of minutes. It's stupid simple, but it works. Print two rails and as many partitions as you need (the .stl is a prepared plate with two rails and 3 partitions). Push the slots in the partitions onto the rails and space them according to your needs, Bob's your aunty.