Multi-cast Surface Hubs

My department has multiple Surface Hub devices around the meeting room floor. We have many instances where it would be helpful to be able to control the devices from a central device - a hub, a computer, or similar. The goal here would be to project a screen, a slide or a video across the devices. 

They are hung on the walls throughout the floor - one example is when we need to usher groups of people back into the main room, we would love to cast an alert on all screens.

Is there a way to do this on the Hub devices? We have considered starting a Zoom or other video call across them all, but that seems like an overly complicated workaround.

Let me know if anyone has any ideas or experience with this.