Welcome Sonoff,
Great seeing you on PF.
I use various of your the Sonoff products and work seamlessly. Looking into new innovative solutions like the loadshedder sensor.
https://www.sonoffafrica.co.za/product/loadsedder/
Looks promising. Keep innovating.
May I ask on the configuration above... although all Neg and all Pos terminals are essentially the same connected points. Why was it opted to have Pos from top battery and Neg from last battery. - I also see this on Pylon manuals, not sure about the reasoning?