I have gotten multi user editing to work and i have gotten NDisplay to work by packaging the project and running it on multiple different machines, however my issue now comes when trying to edit or make changes to the scene, how can i get those changes done in editor replicated through NDisplay seeing at it is a packaged project?
i have the seen a similar question in this forum already and i actually have the same problem. A dev from nDisplay answered that this feature was presented at SIGGRAPH 2019 but is not yet implemented in the official unreal engine but will be come out with the coming updates, no clue when exactly. If anyone has information on it it would be great to know. So the answer is that right now it is not possible as it seems. You might have to wait for it.