Where a camera-angle axis goes

The surgical system adds three camera angles recording at once. That is a new axis, and where you put it changes how easy the rest of the pipeline is to write.

Put it beside the batch axis and every downstream operation treats the angles as independent examples — cheap, but the model can never combine them. Put it beside the channel axis and the angles fuse early, which is what you want if a phase is only visible from one view at a time.

There is no correct answer. There is only a decision, and it has to be made deliberately rather than by whichever stack happened to be written first.