To hold a lot of pliers, it's easiest to just hook them onto the edge of a piece of wood. A lot of pliers go in a small amount of space that way. The piece of wood in this holder is tapered towards the top edge, so that it doesn't force the handles too far apart. It's really only about half full with pliers so far.
Great example of a place to put items that come and go regularly (i.e. returns (to stores and other people), lost & found, donate. Also good to keep bottled water and overflow of items that you don't have storage for in the kitchen.