Tranform the node into a generator in the options panel. Then you will need to set up a "taskforce" with a group of mines or even a single one. Once done, edit the generator and put the new group in the spawn list.
But traveling mines are not healty, they can seriously mess with the traffic. Also, if destroyed, is harder to call for reinforcements. What I did was to spawn them as random naval group and set them as veterans. That way, they go crazy when you get close, they will start moving very similar to a magnetic mine.. very tense. This is already implemented in my WIP :P
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