I have a few folks who are building nearfield desk systems that I am working with at the moment. No, not all monitors make good near field monitors. Any speaker where dispersion or reflections are required for image to come together are bad choices. Raidho or Scansonic would be poor choices for a desktop application for this reason.
You also want to account for your physical placement of the speaker. If your desk is near wall, a rear ported monitor that needs lots of space behind is a poor choice. Some work better than others with port bungs and you may be able to use/implement bass traps and other treatments to work around some of these issues. Secondarily, don't assume a front ported speaker or sealed speaker is automatically a solution.
Finally, there are wonderful stands made for a desktop environment by IsoAcoustics. They would be my first choice. The key is getting the speaker up of the desk and getting that tweeter to ear level.
You also want to account for your physical placement of the speaker. If your desk is near wall, a rear ported monitor that needs lots of space behind is a poor choice. Some work better than others with port bungs and you may be able to use/implement bass traps and other treatments to work around some of these issues. Secondarily, don't assume a front ported speaker or sealed speaker is automatically a solution.
Finally, there are wonderful stands made for a desktop environment by IsoAcoustics. They would be my first choice. The key is getting the speaker up of the desk and getting that tweeter to ear level.