Going to be interesting seeing Ronaldo adapt to gegenpressing...
Annoyingly he will probably fit in very well.
Rangnick is a real counterattacking manager, he'll let Ronaldo and 1 other stay up, wait for the opposition to get into midfield before they press and then try to hit Ronaldo or (presumably) Rashford with the first pass.
If its like his RB teams, all the pressing will be in the midfield and Ronaldo will just have to block passing lanes back to the defence.
Fernandes is the one who is likely going to see his work rate treble.
Should take him a while to implement his system though.