Drill holes of the appropriate size for the screws of the basin bracket. Near the bottom screw, remove approximately 15 mm of the tile using a drill. Be careful not to damage the Tulppa board underneath. Apply a generous amount of the ARDEX CA 20 P, Casco AquaSeal or Sikaflex AT-Connection sealing compound to the screw holes. For the bottom screw, use a foot screw with the first nut screwed so that it lines up with the tile surface. Then install the basin bracket and screw in another nut so that the basin support is locked between two nuts. For the upper mounting points, regular plumbing screws can be used.