best practise upgrading 2 managers connected to one sql DB without replication

hi,

i made an upgrade plan based on the official one.

I want to upgrade 2 Managers (12.1.6 MP1) without replication and both are connected two one shared SQL DB.

Step 1: Create an upgrade plan
Step 2: Back up and prepare for disaster recovery (critical)

  - Disable the "Protect client files and registry keys" Application Control Policy
  - Remove client packages assigned to the client groups

Step 3: Enable local authentication
Step 4: Stop the Symantec Endpoint Protection Manager service on both Managers.
Step 5: Upgrade the Symantec Endpoint Protection Manager (Primary First)

Step 6: Upgrade the Symantec Endpoint Protection clients

is there anything else to add or does this look good?

Thanks.