The accuracy of the microinverter production is about 1% to 2%. So in terms of quality it's good. However, we do not have a revenue grade certification for the accuracy, which is a process unto itself. So, if you need a 'certified revenue grade' accurate monitor, then you can add another device.
If there a SMART meter at the site, if so, you can PAIR a device like this directly to the SMART meter and be DONE with no other hardware (all meters are of course revenue grade accurate).
We are going the same direction as this, next year our gateway with directly read information out of customer's meters.
Did you ever implement this ability to read from SMART meters?