If were shooting the following conversation, how would you set the camera?
It is a multi camera setup with three talent sitting in a living room set. They are "watching" some videos and talking about the content. It is intended to have the feeling of three guys sitting around talking about their favorite video. How would you adjust the cameras for best composition?
You're setup is essentially 3 separate drivers license photos in action.
You might think of COMBINATIONS of people - which lets them interact more natrually.
First, which camera has the establishing wide shot. Knowing nothing about background and lighting and the hundred other things that can effect this - with nothing but the diagram to go on - I'd say your wide shot would balance best from between the jib and the Camera B position. Then pull out Cam 1 so that they have an angle on more than just "head on C" - you can get both an alternate 3 shot - a 2 shot of B+C as well as a single shot on C.
That leaves 3 to cover A&B for singles and the combo 2-shot.
All of this might change, however, if you have to SHOW THE MONITOR as well? If so, you MUST leave a shot so that we can see how the interviewees react to that - which might take a camera by itself - particularly if you want to orient the watchers in positions where you may have to "cross the line" to see the monitor/footage.