Halo is weird just because most times I've played it was with more 8 or more people. We'd have something like 4 TVs going at once with 2-3 people per tv. I've also done something similar with Super Smash Bros, though in that case we had two TVs in the same room just so everyone could be playing. We had a loser bracket tv and a winner bracket tv, and we'd just keep rotating based on who wins each match or something.

Honestly, I prefer having everyone in one room. It's more fun to be commentating and joking around with people while playing.