Answering my own question but here's Sharpe's take on it:-
Looks like a 4-3-3 for Rovers with Brereton and Conway wide, Armstrong as the central striker with Evans, Smallwood and Travis a midfield.
This is how we lined up against Brentford on the last day of the Championship season we got relegated. We won then. I think Mogga likes this formation but Dack stops him playing it more.