I don't think Manchester United will be a good option for Rodrygo because right now what Manchester United needs is a good coach and I don't see Amorim as someone who can bring the best from his players, well some people are saying Amorim will do well next season but for me he will not however is good they give him next season to prove himself, if he doesn't perform well he should be sacked, Manchester United have good players and a good coach can use them to win trophy.
Xabi Alonso does not have Rodrygo in his match plan. So it is almost certain that Rodrygo will leave Real Madrid. But from what I have heard, Real Madrid wants 100 million for Rodrygo. No club will be willing to spend such a big amount for Rodrygo.
Manchester United will not buy Rodrygo by spending 100 million at the moment. Manchester United bought Antony and Hojlund by spending a big amount of money. But we have not seen good performance from these two players. So again Manchester United will not invest money on a player who has not yet proven his ability. We cannot call a player who has scored only 6/7 goals in a season a first-class striker. Manchester United needs a striker who will be able to score 20+ in a season.