FortiManager-VM is licensed based on the number of managed devices, amount of logging per day, and storage capacity. Refer to price lists and order SKUs available through your resellers/distributors. These are also referred to as bring your own license (BYOL) models.
FortiManager-VM can be deployed using different CPU and RAM sizes and launched on various private and public cloud platforms.
1OCPU is typically equivalent to 2vCPU as mentioned in the Oracle Cloud Infrastructure Compute Classic FAQ.