We would suggest fitting the rear two screws first and then swiveling the top section and fitting the second two holes. You should find that the fittings swivel so that the other two holes become exposed. You can watch the following video to help.
We would suggest fitting the rear two screws first and then swiveling the top section and fitting the second two holes. You should find that the fittings swivel so that the other two holes become exposed. You can watch the following video to help.