There is no limit on the number of teams from 1 conference. This is a setup for the SEC to have several teams in the final 12. The rich keep getting richer. Here is a link to a good description of the football tourney. How long before the P4 schools have their own basketball championship tourney?

https://www.espn.com/college-football/story/_/id/40204947/how-does-college-football-playoff-work-rules-dates-format-selection-committee-voting