We’ve talked about this on here before in the context of saddle hunting with a kid - having a cameraman is similar, just a bigger kid!
I have done this successfully with a multi-trunk tree. I think that’s the best option.
I have practiced in a single trunk with my daughter but not done a hunt that way. I am a right-handed shooter, so it seemed to work best and was safest (think of where your broadhead is in relation to the other person) to have her a little over 90 degrees to my right.