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AMC3330: HGND to be derived from the voltage divider circuit

Part Number: AMC3330

I have a requirement of measurement of 3 phase unbalanced voltages. I found AMC3330 is a right IC that works for my application. But, I see two circuits, one in the datasheet, other in the sbaa553 (link2). In both the circuits its recommended to measure the voltage(+/-1V) across the resistor that is connected in the middle of the potential divider. However, in sbaa553 the HGND is derived from the voltage divider. Would this practice is recommended? Secondly, If the phase voltages are to be measured, still the HGND derivation from the voltage divider is recommended?

Finally, can I tie all the DIAG pin and give to the micrccontroller digital pin?

Regards,

Rajesh BN.