Disconnect power over Bus (ex. RS485)

I'm building a automated billing system for a building with about 60 tenants/meters. I need to read the energy usage [kWh] from meters, bill the users and turn off their electricity if they don't pay the bill in time.
I want to keep it cheap and simple and communicate with the meters over a simple local bus system (I'd prefer RS485 but others possible). The meters are all close together and if the bus system supports daisy chaining, wiring is easy.

I will buy the meters and can chose which ones. But where I live there are not too many options readily available. So far I've looked at Hexing, Honeywell and Landis+Gyr. What should I consider when choosing a meter? Support from the suppliers seems bad in all cases and documentation hard/impossible to get. They can't even tell me if I can turn off power using a command sent over the bus.
Are there any brands / models you know this is possible with?

How do I turn off the contactor/switch in the meter? What authentication level do I need? Is there a risk that I will need some passwords/codes for the meters I buy and not get them?

The only information I've found, which might refer to what I want to do was in the DLMS "blue book" (short version):
Disconnect control (class_id = 70, version = 0)
Am I on the right track here?

Thanks for your help!