A low-profile (3U) stackable, hex drive socket adapter holder for sockets seemed to be an enigma. Although this is designed for the “RYOBI AR2034 Impact Rated Socket Adaptor” it probably fits other brands that make similarly sized ¼, 3/8, and ½ drive adapters.
The ½ inch adapter is not as easy to remove as the other sizes since in order for it be low enough to clear another Gridfinity item on top, its resting slope does not elevate its opposite end high enough to grab. However, you can pull it towards its top and that will pivot it out.
The author marked this model as their own original creation.