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Measure the cabinet to the bottom of the brackets, and add the amount of space you want underneath when they’re on the wall (Image 1).
Measure that total length on the wall, and mark (Image 2). Then mark the center point on the wall.
Take the center of the mounting bar, and line it up to the center on the wall, and mark the location of the screw holes (Image 1).
Punch holes on these marks with a screwdriver (Image 2). Then, drive the anchors into the holes, and attach the mounting bar to the wall with screws (Image 3).