I use a remix of https://www.printables.com/model/123617-100x100mm-vesamount-for-monitors for my monitors, but my monitors have an external power brick (about 75x65x30) that I wanted to keep up and away from other heat-generating objects on a messy desk. I designed a little bucket that slides over the dowel, holds a power brick, and has a cord cleat on the back so you can cable manage it.
should be compatible with the original metric version and my imperial remix.
source is available at https://cad.onshape.com/documents/965ce574a291d9a875be4bac/w/eca65e757b5dd516ae48cff7/e/6034cfd063ca230f1b907d64
The author marked this model as their own original creation.