I've made a corner tactic to the 1st corner with my 2 CBs going/waiting there.
All teh corners go to the midlle or to the 2nd post, where i have taken some goals.
So, i think the best for corners should point to the 2nd post with the best header, but its very important that the man waiting outside the box to be very good. Di Maria scored some for me a couple of times.
Hope it helps