You cannot possess more than one pawn at once, if you need to give orders to multiple you’re going to want to use event dispatchers and other things of that nature.
If the camera is attached to the character, spring arm or not, it will move with them. You can adjust this with relative location changes, but it’s often better to go with the Camera being what your movement controls and your buttons dispatching orders.
I can get a full RTS tutorial that can go over that style a bit more for you if you’d prefer, you’d just have to alter it to be more like a MOBA.
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(The series is so many parts)