If you want a solid brazilian CB to pair up with Marquinos and/or Futmas Thiago Silva - Eder Militao is DEFINITELY your man.
Don't be fooled by the 81 ovr, with a shadow, anchor, or sentinel he easily feels like a 85-88.
I used him in a 4-3-3 (4), 5-2-2-1 (switched in game for 4-1-2-1-2) where I play Marcelo as CM, and Eder plays as LB, with a shadow chem.
Super quick to get the ball (feels like a full back on steroids), players model moves more like a mid, than a defender.
Exceptional passing for a CB, so no more balls gave to the opposition just after winning it, which was my huge problem before.
Very agile, turns easily 81 agility, and 72 balance, guy is also not easily bullied of the ball.
He stays in his designated position, no crazy interceptions and runs upfront.
He is "silky" on both tackle and slide tackle, in 33 games I got only 1 yellow card, for a tactical foul.
With 89 stamina he is easily a late game champion. No silly mistakes in 80min+, there are probably a handful other CBs in the game with such a stat.
Unfortunately not the best in the air, where he's like a 50/50 for me offensively, he does not give away silly headers in the box when jumping with the opposing player though.
If I had to compare him to another player I used before, I would say he is everything if Manolas was supposed to be, but FAR better.
Definitely recommend him.