You can mark out the holes by using the Click&Connect feature as a template. The clips are designed such that the screws can be inserted diagonally up to a 10° angle, after which the rail can be mounted to the ceiling. If this angle is too small or if you would like to drill at a straighter angle, we recommend that you use a longer drill or a special drill with a compact head.
Mount the first clip about 10cm from end of rail.
> View here the Click Rail drill instruction