I think he'll be best on the right playing his normal way. He's not likely to fire into the box to get tap ins but we generally work very hard to play in a manner that creates space on the opposite side of the pitch. The system is basically designed to possess the ball and eventually switch field to isolate a tricky winger onto a full back in a 1 v 1 situation. We often start our play down the left with Silva, make a lot of interplay searching for an attack, then flip it out to the fullback or Fernandinho and switch to the other side. In that moment, Mahrez should have space to take on a man and if he beats him create a lot of havoc. This is where Costa/Coman/Ribery/Robben were so difficult at Bayern, because in spite of having the ball so much the system was able to get them isolated in 1 v 1s in deep spaces. Not on the counter, mind you, so even when you beat the first man there's still a fair bit to do, but I imagine the intent on purchasing all these difficult to mark winger types is to recreate this flow of play.