Hey guys, I saw the table but I dont understand "Tower"

Im in the Champs League semi final with a 2 nil lead going away from home, the guy has changed formation

In the first leg I was using 4-4-2 but switched quickly to 4-1-2-2W-1 to counter him and won the ball pack.


Now he is playing 3w-1-3w-1-2 with a 6 star AMC so I know i have to close that down somehow.

The counter guide suggests using a Tower but im not sure what that is, overall ive a complete squad (only 1 DMC) so the team is adaptable.

Any help would be greatly appreciated to counter this person! or even a super defensive formation!

Im currently going 4-1-2-1-2 (narrow diamond)