You don't need to register for reading those guides, btw;;
Also, what midfielders you use depends on what sort of players you have, and what roles they can be effective in. In Southampton, against tough opposition in an away match, I used three midfielders - 1 BWM(Defend), 1 CM(Automatic) and 1 AP(Support), all in Central Midfield, and it worked out well for me. Like I said, depends on your players.