The WHR-L01-W02 is intended to be mounted on the wall first, then the LORIX One to be mounted on it.
Following that, the first step is to drill one of the two holes, put the plastic wall plug and screw the first screw using the torx T20 screwdriver. Do not forget to add the flat washer between the head screw and the surface of support.
Once the first screw in place, mark the position of the second hole and repeat the operation for the second screw. The final result is shown as follow.
Vertical alignment
Thanks to the oblique holes of the support, you can easily adjust the vertical orientation of the support.