GK: Goalkeeper – Defend
DR: Full Back – Automatic
DCR: Central Defender – Defend
DCL: Central Defender – Defend
DL: Full Back – Automatic
MCR: Central Midfielder – Defend
MCL: Deep Lying Playmaker – Support
AMR: Winger – Support
AMC: Advanced Playmaker – Attack
AML: Inside Forward – Support
STC: Advanced Forward – Attack
The 4-2-3-1 is good for all styles of football due to its flexibility, but in order to have any success with it, it is essential that you play a central midfielder on defend. Without this, your back four will be left isolated and will be overwhelmed.
The full-backs need to be defensively solid and it's preferable not to give them attacking roles as you want to maintain a defensive shape in the side. The striker can have any role that suits him best, but you may have to adapt the trio behind him to accommodate his role. For example, if he is a target man or plays deeper you need an inside forward to make attacking runs past the forward to exploit the space he leaves or use the balls he plays.
how about this set up ?