Honestly I will not underestimate RB Salzburg and Brest, moreover Madrid is still a bit unstable when playing against teams below them. However, because this is the Champions League, at least Ancelotti and his troops understand the atmosphere on the field much better. Talking about the Champions League, the most important thing is the mentality to play until the end, therefore RB Salzburg and Brest must be able to match the mentality of Real Madrid game. That is the only key that other clubs need to prepare when playing against Madrid.
I also think so, overall Real Madrid's performance this season is very inconsistent and also the matches in UCL cannot be underestimated especially overall the strength of RB Salzburg and Brest is not that bad this season so it is also possible for RB Salzburg and Brest to make a surprise when playing against Real Madrid later.
I think everything is possible in the remaining 2 UCL matches before the playoffs later and I think Real Madrid cannot be favored excessively.
When you play in UCL there is one thing that should not be forgotten, never underestimate Real Madrid. In the midst of its inconsistent which is not too promising but we have seen this phenomenon many times. Even last season Madrid who lost Benzema could survive to the final, so I am optimistic for Madrid to continue in the remaining 2 matches by winning 3 points. With the note that the score is thin both when it comes to RB Salzburg and Brest.