The Xiaomi Mi Vacuum Cleaner G10 has a very useful wall mount/charger, but when a standard brushbar is connected to a vacuum cleaner it needs a lot of space. This wall mount enables to have a brush bar separately on the wall. It is probably compatible with G9, but I have never tested it.
The wall mount has two holes with a 4 mm diameter and space for a screw head with a 7.5 mm diameter.
The author hasn't provided the model origin yet.