I needed a break from Stage Traxx and have now made Stage Cue compatible with macOS. The new build 56 has been uploaded to Apple and is now waiting for review. I will write here once it is available. You can download it via Testflight on the Mac.
On Mac the app opens an additional video output window that you can place on whatever screen you like. It is also possible to open multiple video output windows (cmd + n, or Files > New) so that you could output the video in multiple connected screens.
Everything else is identical. To move your video board from one app to another, just copy the contents of the Stage Cue folder.