The ADC inked above has isolated grounds so you can ground each battery separately using the inputs.
The board you’re looking at has a shared ground so there will be a ground difference of 45v between the first and last cells. This this will exceed the 0-5v limit of that sensor.
Basically if you isolate each starting voltage as the GND and input the voltage after the battery it will stay within the 0-10v limit of the linked ADC.