3-5-2 against the 4-5-1 flat woud be best used with long passing with zonal marking and down both flanks no counter no offside trap. Attacking tactics should be focused on long balls. This requires a forward with good pace and speed.

also you can use this also in the second half time

----------------ST---------------
AML------------------------AMR
-----------MC-----MC-----------
DML------------------------DMR
----DC(UP)DC(DOWN)DC(UP)-

and I hope you win if you have squad like him you will win but if your squad is weaker than him you will find some difficulties but inshaa allah you will win finally