Manchester United won't even submit a high enough bid for Mason Mount and now people are thinking that they will somehow purchase Mbappe for 150M+?

I'm ruling out his move there. They are more likely to sign Neymar than him. Tells you a lot about Mbappe.
Also there is no way he is joining Chelsea, the other club he's (somehow) linked with, since there is no Champions League or even European football next season. Real Madrid is his only destination (that is, if the Madrid faithful even forgive him for overlooking them last year).
150 million+ is too high for an English team to buy him they will certainly be in trouble and the one who is willing to pay that price is Real Madrid, there are even rumors that Real Madrid will be fully eyeing Mbappe this season as a signing but I don't know what happens at the end of the transfer window this summer.
I dare to believe that no Premier League club will dare to buy Mbappe unless players are under 100 million, and it is still very difficult for them to buy because some have limited budgets for spending on players.
I would be very happy for him to go to Real Madrid.