Simple mount that fits under one of the screws as pictured. Designed for the Karcher Puzzi 8/1C but may fit other models. Should fit a box of tablets snug inside.
Rotate the model to be upright. Print Needs Support for the mount overhang.
Unscrew one of the chassis screws on the unit, then screw it back on over top of this mount.
The author hasn't provided the model origin yet.