We should start playing him up top with Martial IMO. Don't think he's a lone striker type (still young mind you), but I don't really like him on the wing either. He runs into dead ends too much and kind of just wants to sprint past everyone and cut inside to shoot instead of using his brain. When he plays through the middle, he can run the channels, drift wide, drop deep to pick up the ball and shoot from distance, or run in behind.
Though overall his performances have dried up quite a bit the past month or 2, and on top of that he's been a bit whiny on the pitch and not showing that same "exuberant youth" attitude that he had his first year. He'll be fine long term of course, but I really want us to start building towards a tactic and set up that can get the best out of both Martial and Rashford, as they are our most talented attacking players.