Surface Doors come in different designs. Smooth doors are best suited for stable mounting. If there are reliefs, windows, patterns, etc. on your door, it is important that there is no elevation higher than the height of the door fitting within 30 mm of the lock.
Door fitting The door fitting determines the mounting variant and how stable your Smart Lock can be mounted. Basically Nuki supports a shield or rosette fitting.
Backset If a door opens outwards, the backset* must be significantly higher than 3 cm (up to 7 cm) so that the door can still be opened after the Smart Lock has been installed.
* The backset refers to the distance from the center of the keyhole to the outer edge of the door.