It's a good thing that Mbappe is been signed by Real Madrid for five contracts but my area of concentration is where would Ancelotti choose to play Mbappe fully as his wing since Ancelotti likes playing 4-4-2 or 4-3-1-2 formation for Real matches. Let's not forget that there are quality players like Rodrigo, Vinicius, and Bellingham occupying such playing formations at the frontline.
I think that by next season, Ancelotti will introduce another tactical formation of 4-3-3, to bring Mbappe in, in every Real Madrid match of Laliga or Champions League, to avoid issues or confusion that will arise based on how to feature Real Madrid frontline players
Naming these magnificent players, Vinicius Jr, Rodrigo, Jude Bellingham are the main goal scorers for the club and they've deliver the team interms of struggles. The UEFA Champions League title, winning it is no difficult phase for Real Madrid. They've the best squad and thrashing opponents seems easy for them. Choosing a tactical formation for Real Madrid wouldn't be a problem for Carlo Ancelotti.