Weathermatic Smartline SL1600

I have a 8 zone sprinkler system and attempting to replace it with rachio. I see there are two wires (WHITE WIRES) joined together in the common wire port. Should I do the same in Rachio or separate them and use both the COM wire ports in Rachio?

I have mine separated. They are connected internally. Looks like a straightforward conversion with eight zone, either a Master Valve or Pump (M on Rachio, but you probably already knew that). Please feel free to let us know of any other questions or how it goes.

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Very helpful! and thank you for the super quick response, Thomas