One win and one draw is enough for Real Madrid to advance to the next round with the scenario that other teams also want to win.
My worst case scenario, the home game will be won and the away game will be drawn. If it really happens, then 4 points will be obtained and can save Real Madrid's hopes for the next round.
It could also be that in the last two matches, both of them Real Madrid can win.
That scenario is also still risky because it will depend on the results of other teams' matches, to be safer they must ensure 2 wins will be theirs in the last 2 matches they will play. In terms of calculations, that is correct, but once again it is risky, because no one knows the results of the matches they will play. It is quite sad to see a team with the status of defending champion having to fight hard in the last 2 matches, and that does not make them automatically qualify but most likely they have to go through the play-off round to be able to be in the last 16.
The target of winning can certainly be Real Madrid's target. Although the scenario I mentioned is still risky, but one win and one draw is quite reasonable if people judge Real Madrid's performance in the Champions League as not good based on the results received this season.
Against Salzburg and Brest, I believe that the result will be won by Real Madrid.