I expect Manchester United to attack in this match, because they have almost sealed their champions league spot for next year through premier league, hence I don’t think that they’ll defend in this match. Furthermore at the minimum 2 - 0 sounds good to me as a Manchester United fan, but I would be absolutely delighted if they can make it 4 - 0 at full time.
Idk if this is the right approach for ManUtd since Milan will expect that kind of strategy. I believe that taking over the midfield zone, been cautious at the back, and patiently starting building their attacks will have better results. Besides, we are talking about Milan and not some "easy" team...