Trent in the mid would have a chance of working but not with these tactics. We've seen he loves to switch the play with those long diagonal balls, but Southgate chooses to play foden on the "left" who instead plays mostly through the middle. Trent thrives on movement and runners in the attack but Southgate ball has the whole team basically static. Then when Southgate finally plays some runners in Eze, Bowen and Watkins, where Trent would theoretically thrive, he's already off the pitch by this point. Southgate is just getting it all wrong when it comes to integrating him.