Yep, confirmed. I built the turret closer to the rest of the base and it detected correctly.

This locations just seemed like the most effective choke point.

Me too on 0.17.4

I recently felt the need for loads of Speed 3 Modules, so I built a module for it. I'm pretty happy with the result.

It tiles nicely
The ratios between the factories match perfectly
You can easily change the blueprint to Efficiency or Productivity modules