Note- Foes must spawn beyond this green box, and won’t immediately engage
the turret.
Note- Foes can spawn around your base. And you can't build there to stop
them.
Holes are bad
When you reposition any structure or wall (but not decorations), it shows white
lines one space larger in every direction from the structure. This is the region
where enemies can spawn. Be certain you don't have any gaps in your base to let
them appear inside your fortifications.
Overlapping Defenses