Monitor 4 batteries in series

I have 4 12.8v LIFePO batteries(no comms) in series for my 48v inverter. I would like to monitor each battery separately. I can not find a proper wiring diagram the 300A smart shunt when batteries are wired in series. Any help would be appreciated.

Google for “ 4 channel battery voltage meter”

Many results.

Or, buy three battery balancers and not worry about any of the four in series having a higher voltage or SoC than the rest.