Szoboszlai exclusively played as a CM at Liefering and it's only under Marsch at Salzburg/Leipzig, that he's been used in a more advanced role on the left.That was pretty rarely though. He could play in an advanced role in a three man midfield, but that's about it. Not exactly what we will be looking for imo. Mostly plays on the left.
edit: In our current 4-2-3-1 setup he'd compete with Rashford or Bruno but definitely not McTominay.