I mounted mine to a column so I needed two pieces of wood so that I could install the screws thru the top and bottom grommet holes.
For a drywall installation I would just have used drywall anchors similar to what you would hang a framed picture or other item on a wall. Mount the top first then pull it nice and snug/ flat before installing the lower anchors.
Post a few pics once you get them all hung!
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