MR takes Right Corner and ML takes left corner.
DR takes the Right Throw-In and DL takes the Left Throw-In
Credits go to Prutton and Magician for the Set Pieces.
In order for the tactic to play very well, the most important attributes for in FM21 are Pace, Agility, Balance, Acceleration, Dribbling and Vision (only Pace, Agility, Balance and Acceleration matter for the Center Backs so don't worry about Dribbling and Vision) When you're in a top division league maybe make the requirements for those around 13, 14 or 15. If you're in a Lower League like Sky Bet League 1 or the French National league lower the requirements.
These are the results I have gotten when I tested it and when others did as well.
Liverpool 140 Goals, treble done and Salah 36 goals in the league
A user by the name of GonçaloM on discord tried in his save for a Champions League game and this is the result he got