Autopole

Autopole is a mod that automatically connects a pole when you place it to the nearest available pole.

To make poles connect: press shift while placing a pole to place it in the ghost mode - if you have enough available poles - the pole will be connected to the nearest one. The mod will automatically place all poles in between the pole you placed and the nearest one.

You can still place poles normally without connecting them - the mod only connects poles placed in ghost mode.
Note that placing entire blueprints with poles will not do anything.