Multiple views for a scene to be projected simultaneously with 3 projectors

Hi, I am new to Unity and have created a project where the main camera view is in side a box which rotates. Now, I would like to project the scene in a room, but add 2 more projectors to project adjacent sides of the cube as it rotates (AK simulating actually being inside the cube). How could this be done? Other than adding 2 more cameras 90degrees from the initial one, I have no lead on how to begin and how to do the build of this project. Any help would be highly appreciated