You can install multiple Google payloads.
Each Google payload sets up a Google email address as well as any other Google services the user enables after authentication. Google accounts must be installed via MDM or by Apple Configurator 2 (if the device is supervised).
The payload never contains credentials; the user will be prompted to enter credentials shortly after the payload has been successfully installed.
Description of the account shown to the user
Full user name of the Google account
Full Google/Gmail email address for the account