With Real Madrid's current position in 20th place, then most likely the play-offs scheme or result simulator will be like this that will be faced by Real Madrid. However, all that will change if Real Madrid's position also changes. This will depend on the results of the next 2 matches where Real Madrid will face RB Salzburg and Brest.
Source: UCL Result simulator
Source: UCL Result simulator
I see you used a UCL result simulator from the UEFA official website? What is the "or" for in the first column when it says "Bayern or Dortmund" for instance? Will there be a drawing or is it fixed that 9th plays against 24th, which would clearly make most sense.
But as you can see a whole lot of trouble is waiting for so many great teams. Manchester City could be facing Atletico Madrid. Real Madrid could be facing Atalanta or Juventus Turin.
The way to the final in this format when a team does not qualify for the next round via the top 8 can be so much harder than it used to be because even when they get past the play-off stage, the next big opponent could be waiting already.