nDisplay 3D config editor - How to set up 2 x cameras with a frustum on each viewport

This is for version 4.27 of Unreal using the switchboard workflow.

I would like display two viewports using the same static mesh.

One viewport_1 would show the frustum of camera_1 and viewport_2 would show the frustum of camera_2.

I would then set set these viewports at different points on the led wall and use Brompton frame-remapping to alternate the viewports for two different cameras on set.