FortiManager for GCP can be deployed as VM instances. Supported machine types may change without notice. Currently FortiManager supports standard machine types, high memory machine types, and high CPU machine types with minimum 2 vCPUs and 7.5 GB of RAM and maximum 96 vCPUs and 624 GB of RAM in the predefined machine type lineup. You can also customize the combination of vCPU and RAM sizes within this range. More details on predefined machine types can be found here.
Latest supported machine types can be seen under machine type selection if you try to launch FortiManager from the marketplace listing or Compute Engine portal.