When you have multiple people on stage, you need a good, high contrast background (no black suit, black background floating heads, please!) and multiple cameras to cover the discussion. One camera per person is best, but two is the minimum. Why? Because that way your audience gets to see who’s talking and who’s talking next without getting seasick due to rapid camera movement from one speaker to the other. Multiple cameras and an excellent director calling the shots takes your panel from ordinary to ultra professional. That reflects on you!