Hansgrohe PuraVida 15775 1 Série Mode D'emploi page 9

English
Remove the mounting ring.
Drill the screw holes using a  mm bit (1).
3.
Install the anchors (2).
2.
Seal the ceiling around the anchors using waterproof
sealant (3).
1.
6 mm
Install the mounting ring.
Install the screws.