The Mountain West title game is set between San Diego State and Wyoming, but the location is still not yet determined. The conference goes with the highest rated school in the College Football Playoff but since neither are ranked it goes to a tiebreaker and the first is computer ratings, and not head-to-head.
It does seem silly that head-to-head is not the first option used if neither are ranked, because if that were the case then the title game would be played at War Memorial Stadium in Wyoming.
The computers that the conference come from some of the old BCS formula and include Colley Matrix, Anderson & Hester, Billingsley and Wolfe.