ceiling rose / canopy with 3 holes, where one canopy is then common for 3 lamps
ceiling rose / canopy with 3 holes, however the holes are enlarged so that the original mount screw and nut, both enlarged to 105%, fit into the hole (I used a braided wire that was slightly larger than a normal wire)
bracket modified to use a classic 4 mm wide (wood) screw (thus M3 insert is not needed)