is 5-1-2-1-1 legal? if so, how can i beat this formation?

--------ST------
-------AMC------
-----MC---MC---
-------DMC------
DL-DC-DC-DC-DR


So my opponent is using this weird formation that i've never seen before.
Seems to be working for him, but is this legal?

I imagine I have to go strong on the offense.

Maybe man on man marking to counter ST and AMC lineup?

Advice please, thank you!

3N-5-2 V-Style? I'm guessing this with 4-1-2-1-2 ND gets countered by 4-5-1 V-Style.

Wow ya, look at my thread I made about very defensive opponent, as far as tactics I used red arrows on both wings and heavy attack mixed with man on man marking, no trap no force counter.

Good luck!