For anyone without a garden or front garden
With an apartment, an upstairs flat or a home with a shared entrance, a freestanding column is not an option. There is no patch of your own land and the hallway is shared. That is why the Compact mounts on the wall: next to the door, in the shared entrance or on the walkway side.
If you live in a building with an owners' association (VvE in the Netherlands), check the location with them first. The inside of your own front door frame is usually no problem, a shared wall sometimes is.
