I thought McClaren preferred set up, to the extent he seems to have a set up, is 4 2 3 1.
With us this season, yes, he has played 4-2-3-1. Perhaps based on available players.
Historically, I understand his ideal “vision” of football is 4-3-3.
I expect to see 4-2-3-1 at the start and then possibly two up front later in the gane.