I can't imagine that the Rockets will be able to pass the Mavericks. They met a couple of times this season and although the Rockets were able to defeat the Mavericks at one of those meetups, the Mavericks didn't have Luka Doncic, Kyrie Irving, Daniel Gafford, and P.J. Washington in that game while the Rockets were playing at their full healthy lineup. The Timberwolves recently destroyed one of the top teams too, the Denver Nuggets, and they will be really a tough team to beat for the Rockets.
Confidence is not enough for the Rockets to win but as you said and I agree with, who knows?
If you are a risky bettor, you can put some extras betting on the Rockets' Moneyline and point spread. I'm sure the odds for them will be juicy.
At this point, there's no impossible for the Rockets as they are the hottest team in the NBA now. Betting on moneyline is still good, they might be the underdog but at least you are getting enough value since their confidence is too high that they can beat any team they'll play with. Just think about this, if an undermanned Hawks beat the Celtics twice, how much more a healthy Rockets who are streaking hot?