Real Madrid will definitely prevent Mbappe's ego. Ancelotti is a great coach and resolving situations like this is his specialty. I'm sure he thought about these during Mbappe's transfer because Mbappe had great tolerances in PSG. Their privileges over other players were obvious. I know, like everyone else, that this will not happen in Real Madrid.
I also think that this kind of ego thing from Mbappe was already thought about by Real Madrid when they wanted to recruit him into the Real Madrid squad. And what you say is also true that Carlo Ancelotti can definitely handle things like that at Real Madrid and keep the atmosphere peaceful between all the players. Because Ancelotti not only has experience in training any player, but also has a way of not giving birth to any ego in any player he trains.