Best practice for href in "thing" Modbus binding

I have a question please and it is related to the modbus href.

For thing description forms, it seems href is mandatory. My issue is with a thing that talks modbus.

I have my device entry point defined at the base level (base : modbus+tcp://127.0.0.1->IP:502->port/1-> unitID)

then for each form of property or action or event affordances, i have my modbus:address defined as modbus:address : address.

do I still need the href in the form definition? or I should put it and leave it blank or I should put the datapoint's address in the href and omit the modbus:address.

which is the best practice for the modbus client application of nodewot.

Thank you.
Kazeem.