The 4-2-4 is a rarely played system, and in my opinion you don't need to play with 4 up front. Better to play with 4 players in midfield and make sure the 2 wide players; RM/LM get wide and forward at any opportunity to supply crosses for the forwards and general support play, however when the team is not in possession the RM/LM should tuck in behind the ball to provide support for the Center Midfielders and the Full Backs.
Hope this helps
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Could someone give me their opinion on playing a 4-2-4 system. I believe this is not a good system to use for soccer but a coach we have wants to use this formation. Thanks in advance for any feedback