Cereal Killer has a video that shows how to create a DIY stand for Eurorack all-in-one synthesizers.
The 4-tier stand is custom-made to fit the Behringer Neutron’s width. However, as seen in the video, the design may simply be modified to accommodate fewer or more synthesizers, as well as synths of varying widths, such as the Behringer D or Moog Eurorack synths.
Check out the tutorial