1.Determine the center position of the rectangle mounting hardware ,it should be 70 mm/2 3/4 inch from the back of the lid (do this bracket last so you can line up the closer with the side of the cabinet),as distance to the side of the lid, it depends on the thickness of your box/kitchen cabinets,then mark A ,drill 2 holes on the sides of the center point A
2.Determine the center position of the round mounting hardware, it should be 240 mm/9 7/16 inch from the back of the cabinet, and 10 mm/2/5 inch from the top of the cabinet ,then mark B ,drill 3 holes around the center point B
3.Fix the connectors and connect the joints and the strut