Any way you all want to do it is totally fine. I personally like making the first two matches 10 minutes, the last 5 minutes - the squad behind scrambles like a mofo to get kills!

The idea of keeping matches short is to keep it from getting old, that's why there's no tiebreakers.
Glad everyone's having fun with this... It'll be interesting to see how things start going once a squad wins 1st tier & the rest try to win the tier they're in.