I installed the cabinets myself. Instructions and suggestions were pretty much non-existing. A few drawings only. Attached the mounting brackets nice and level, then put the “single” cabinet on the bracket for securing- low and behold, the cabinet was out of square. The mirror front panel could probably be adjusted to make look more level but absolutely no information on hinge adjustment. One hinge looked not attached well at all.  Finally shimmed the left side single cabinet to be level but can you imagine what that did to the positioning of the brackets for the right side double mirror. Do only a little installation at a time - not what would seem logical.