What positions are the screw holes in a made to measure mirror?
Screw hole positions in a medium to large mirror with 4-holes are set at a standard 50mm in on all 4 edges, for smaller mirrors the screw hole positions are set at 25mm to 30mm depending on what looks best.
Alternatively you may specify where you would like the holes to be in the Customer Notes section of the Confirm Order page so long as this is more than 10mm away from any edge.