Real Madrid's brilliant achievements last season cannot be separated from Carlo Ancelotti's expertise in concocting his strategy. Even though there is no pure striker in their starting lineup, that is not an obstacle for Real Madrid to continue playing well and achieving lots of wins. Real Madrid even became the team with the most goals scored last season in La Liga (87 goals).
I think what keeps them productive is that every player feels comfortable with the strategy given by Carlo Ancelotti, and they can quickly adjust to circumstances when there is a transition from 4-3-3 to 4-3-1-2 or vice versa.
Carlo Ancelotti always seems to know how to make players adapt quickly. Even Vinicius Jr, who was initially someone who focused on the left wing position. It turns out he can also play like a main striker. And actually, the formation that Ancelotti used to cover the shortcomings of their team, which had not yet found a suitable striker, was to use a 4-3-1-2 formation. With this formation, Ancelotti succeeded in making every wing midfielder and attacking midfielder able to play comfortably even though they were positioned as attacking players. But with the arrival of Mbappe the formation will use more formations like when Benzema was still there. Where Mbappe will be the spearhead and keep Vinicius Jr in his original position and in his usual position, namely the left wing. Even with the arrival of Mbappe, I still feel that all the players will remain comfortable with the positions they will be given.