I needed a better way to hang my winter coat and the one provided in my office sucked, and the locking coat hook was made. It is made to lock on top of the curved metal top piece that makes up the top of the cube wall and will lock into place by gripping the edge of the metal. It is also helped by the soft walls of the cube.
Update: I made the stem on the hook thicker because mine broke after 4 months of use.
The lower hook will need some support and so far the 20% infill seems adequate.