hey guys! i need a little help here!

It seems that every thread that i search are about 4-5-1V, but very little to none that is about countering formation 4-5-1 flat.
I will be playing in the CL quarterfinals later. My team quality is about 6 points more than his, but i will be playing as Away.

any guides or pointers please? Ive read some of the thread and many of them use 4-5-1V but failed.

So should i go with 3-5-2 on attacking, through middle, own half, normal tackle, long passing and zonal marking? what about arrows?