The arrangement you are considering is known as an aggregate net metering account. There are a whole bunch of "ifs" to consider and many ways to set up an aggregate account. As long as the properties are all owned by and billed to the same individual or entity, it is possible. PG&E calls this a NEMA, or net energy metering aggregate, account. They are in the second phase of their plan, as they have signed enough agreements to fulfill the original net metering offering.
Too many details to consider; look here:
https://www.pge.com/en_US/business/s...ndard-nem.page
The first thing to do is check whether PG&E is allowing any new net metering accounts at all. They (along with many other power utilities) have tightened the belt on net metering arrangements in the last few years. Good luck.