These are some 2lane rail blueprints with an integrated roboport network. The robot network is automatically separated at every junction, which prevents the robots from flying outside of the rails perimeter, essentially enabling concave networks. Each separate robot network "cell" request items from neighbours as long as said neighbour has more of that item available and then kickstart itself when any logistic robots were requested. The maximum amount each cell can request is set by connecting a constant combinator to the green wire running on the large powerpoles. There should be no harm in connecting multiple cells together.
The rail prints are also available without the circuit networks here