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The game against Napoli was probably their qualification for the round of 16 already because that was the game when most expected them to potentially not win all 3 points, but now that it ended with a win and since the Union Berlin game also ended with 3 points for them, it is unlikely that they will get into similar situations during the next games. There is no need to win against Napoli at home as a draw would probably be enough and the two games against Braga won't be a failure either. The big pressure is already gone.
I agree with you, Real Madrid's pressure to qualify for the round of 16 will never be great as long as they manage to win all their games against weaker teams like Union Berlin and Braga. I think Real Madrid only needs 6 more points to ensure they advance from the group stage, meaning they only need 2 win from the next 4 matches. That scenario must be true if Braga and Union Berlin lose to Napoli, as well as Real Madrid.
No one doubts that Real Madrid failed this season in the group stage, if that exists then they are just fighting with their own principles that don't know Real Madrid. The real challenge for Real Madrid is in the last 16, quarter-finals or semi-finals if they succeed, but I don't want to talk too much because I don't know who the potential opponents will be.