FWIW Monterrey won the N American (Concacaf) Champions League.
The 2020 qualifications are a little different with only Mexico(4), USA(4) and Canada(1) getting auto-bids. The C American/Caribbean countries have to qualify through a pair of international qualification Tournaments.
Mexico gets their fall and spring finalists. So America and Cruz Azul qualified through their fall tourney. Spring is tbd. If one or both of them make it back to the spring final then the remaining bids are doled out using the aggregate Liga MX standings from spring and fall combined.
Canada gets the Voyageurs Cup winner only.
USA gets the MLS Cup winner, the US Open Cup winner, the Supporters Shield winner, and the top team in the division opposite the Supporters Shield winner. If one team wins multiple qualifiers, or if one or more Canadian teams win them, then the remaining USA field will be filled out using MLS regular season standings (points).
So the key qualification tournaments remaining are the Liga MX spring tourney (both finalists), the US Open Cup winner, the Voyageurs Cup (Canadian) winner, the MLS Playoff winner, the Caribbean Championship winner, and the top six teams from the Concacaf League Tourney (C America+).