For this clamp-storing tip, all you need are some joist hangers turned 90 degrees. Learn how to store parallel-jaw clamps.
The Best Parallel Clamps for Your Workshop - Bob Vila
Rockler Sure-Foot F-Style Clamps
Joist hangers store parallel-jaw clamps - FineWoodworking
Rack for Storing Parallel-Jaw Clamps - FineWoodworking
Rockler 24'' Parallel Bar Clamp
Parallel Jaw Clamps - FineWoodworking
Clamping And Gluing - Page 2 of 21 - FineWoodworking
60-in Parallel Jaw Clamp
Jorgensen 60-in Parallel Jaw Clamp
Workshop Tip: Store Pipe Clamps Under Your Workbench - FineWoodworking