This shelf is perfect for our office. I know that others have discussed issues with mounting, but take it from Axel Rose, “all you need is just a little patience.”   You will need a level and a laser level is also helpful. Some tips:

1) Measure the midpoint of the wall you want to hang the unit and mark it
2) Measure where you want the very top of the unit to be and mark it
3) The unit measures from tallest vertical board to lowest vertical board at 51 3/8”
4) The unit measures from farthest left horizontal board to farthest right horizontal board at 45.5”
5) The top hanging screw holes measure 12.75” from the tallest vertical board
6) The distance from the farthest horizontal board to the screw hole is 15”
7) The instructions provide the additional measurements you need

Took me about 30 minutes to assemble and hang.