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It is insane there isn't an option for some sort of link cable that allows them to communicate and set each others clocks. Some sort of low voltage, optoisolated, common protocol, maybe I²C style. It could even be manufacturer specific which would help lock you into their brand. Would cost them pennies. They could call it KitchenSync™.
Slightly out of sync clocks, which is a bit annoying.
The electricians turned one on after the other. Should be fairly easy to rectify by turning off both at the isolator for a while and turning them both on at the same time.