I recently bought several ikea RIBBA frames but the mounting plates are far from the wall. I suppose that they are designed to be mounted on plastic adhesive hooks because they are super light. However, I want to change the acrylic for glass in the future and I will need a screw (due to weight), so I designed this little hook to be used with a single #6 screw (tolerances are tight, if your printer is not very accurate you may need some sanding for the hook)

Be aware that the hook is a total overkill, but I don't want to have some issues with creep in the future (it's printed of PLA).