3 node cluster or HA

[M.Sridharan]

Hi community.

I am setting up a palo alto firewalls for  a customer and they need it as 3 nodes. they are going to be placed in three different buidling inside the same campus.

I have gone through the documents and seeing that clustering is the only option as it is 3 in number.

I want to know is there any way that i can make this into HA of 3 nodes with their HA1 and HA2 being switched using LAyer 2 extensions across these buildings.

Also if i want to form a cluster, only session synchronisation is achieved via HA4 links, won't the config and control plane activities wont be synced across the cluster members via the Group master ?

OR config sync for cluster can be achieved only via panorama deployment ?

Kindly shed some light on this to get me decide things up.

Thanks in advance