Managing a FortiGate HA Cluster (Active-Active) Without FortiManager

We are planning to set up a High Availability (HA) cluster in Active-Active mode using two FortiGate 901 firewalls.

Our question is straightforward: is it possible to create and manage an HA Active-Active cluster without using FortiManager?

As far as I understand, the creation of the HA cluster does not require FortiManager. After the cluster is established, all settings configured on the primary unit can be automatically synchronized to the secondary unit through FGCP. Additionally, the primary unit can be accessed and managed directly via its web interface.

I would appreciate an official response to this query so that I can share it with my manager.

Thank you for your assistance.