EKM Metering

i was considering this meter "EKM-OmniMeter II UL v.3 Universal Smart Meter, Single Phase or 3-phase, 120 to 240V, 50/60Hz up to 5000 amps" I am not 100% certain about the amperage of the system as i am in the process of constructing the office and i haven't yet come to a solid conclusion ...

Good day, I have a question for those of you more experienced with these meters. In my office I have 110v lights and wall sockets and a 220v air condition unit. In order to monitor the over all monthly KWh usage of the entire office and all of its devices, do I need two separate meters? One for the ...