Two questions here:

1. Is there a way to adjust the times the zombies are active?

2. Is there a way to get a turret to shoot at the zombies? I know the turrets at the Outpost/Bandit do, but player placed ones don't.

Any answer to this?

1. Yes, there are options in config to change both the time they spawn and the time they are destroyed.

2. I don't override any behaviour to do with player turrets so whatever it does will be vanilla behaviour.

Merged post

p.s. sorry for the late reply.