The first installation method is called through.

The first installation method is called through. The whole structure is mounted on the door leaf, then a lock and two loops are inserted into it. The box is drilled through and attached to the wall using large screws (usually enough eight pieces). In order for the design in different states to be in one place, it must be adjusted in place using wooden wedges. After that, the gap between the wall and the box is filled with foam.