where to put point c?

mistertilapia

L1: Registered
Jul 24, 2016
17
4
i am creating an attack/defend map, and i have a few ideas on where to put point c.
in this screenshot, point a is the blue capped point, while point b is the red capped point.
20160816230602_1.jpg
i think my options are on the brown roof, or on the dirt displacement to the right of the brown roof, unless someone sees an alternative location.
which seems best, and why?