It all very much depends on how he would be used and what formation. At Atalanta I believe he plays as the more advanced CM, or at #10. That’s where he does his best work. At the national team they play 352 and he mainly gets deployed at RCM, in between de Jong and Dumfries. Over there he doesn’t break much balls. Off course, there could be other reasons than personal attributes that play a deal.
So would we keep our current formation I would pass on Koopmeiners, there would be no sense in trying to mould a player into a position if you already know his strong suit is elsewhere before buying him