A CAN bus is meant to be an (electrically) straight line with a terminator at each end and nodes (at least two) attached along it. That means just two terminators. 

If your willing to give up some length and/or noise margin, you can add some stubs out to nodes. As long as they’re short, they don’t hurt too much. One imperfect heuristic is to take twice the length of the stub away from the possible total length; a coarse approximation but a starting point. 

Extra terminators, especially near the center of the bus, have more of an effect of the maximum number of nodes before noise sensitivity gets poor. 

With three nodes close together, almost anything will work, though, so don’t worry about this too much. Just put two terminators on, one at each nominal end, and enjoy. 


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