2) From the room with three TV's I can use a universal RF remote in combination with an IR blaster in the closet which will let me independently control all three minis. And then in the other rooms I can either use a DirecTV RF remote or I can use a universal remote with IR blasters.
This is your only option for the three-source room if you want to use a single remote. There's no guarantee you're going to like it; the exercise of switching receivers may be cumbersome and require considerable discipline on the part of the operator.
You tape the blasters in front of the IR sensors on the receivers/streamers in such a way that outside light cannot exit (or enter). In that way, you insure that the light from the emitters doesn't control another receiver (all-important).
I'm not sure why you think you're getting conflicting information. I think the real problem is that you've presented a number of different (and substantially unrelated) issues and people are picking one of them and running with it. I chose the remote issue because it seems like it could be a show-stopper.