Each of the Maori seats presents an opportunity for tactical voting for a left-wing voter.
If you favour the Maori Party candidate in your seat, and you think you can trust them to support working with a Labour-led government, then go ahead and vote for them. But give your party vote to the Greens or Labour. Not only will this signal to the Maori Party that you want them to work with the Left, not National, it can help the Left win more seats. Because the Maori Party is set to win so many electorate seats compared to its share of the party vote, giving it your party vote too won’t get it any more seats. Rather than waste your party vote, give it to another left-wing party that you like and help them gt more seats.