Steps to add new DNS-Only server to existing cluster?

Hello,

Can anyone tell me what are the exact steps to create and add a new cpanel DNS-Only server to an existing cpanel DNS Cluster?

(We have 2 existing DNS-Only servers, and want to add a 3rd but it's been many years since we did this.)

Here is what I have:

1. Build new cpanel server using DNS-Only. (Let's call it "NewNameserver".)
2. Login as root to WHM on NewNameserver and click the Home »Clusters »DNS Cluster link.
3. Click the "Enable DNS Clustering" button.
4. Ffor EACH web hosting server:
   1. Login as root to WHM on the web hosting server and click the Home »Clusters »DNS Cluster link.
   2. Click the "Configure" button under the "Add a new server to the cluster" section.
   3. Enter the hostname for NewNameserver, root username, and root access hash.
   4. Check the "Setup Reverse Trust Relationship" box.
   5. For DNS Role, choose the Synchronize Changes option.
   6. Click the Submit button.
5. Go to step #4 and repeat for every web hosting server.

Is this correct?

QUESTIONS:

1. Should we be using "Write-only" as the DNS Role instead of Synchronize Changes?
   
   
2. How do we get all the zonefiles from the existing two DNS-Only servers to copy over to the NewNameserver so all three DNS-Only servers will be serving the same zonefiles?
   

Thanks!

 

What should be the role for our DNS-Only nameservers where the zonefiles are served from?

What should be the role for our web hosting servers that are "sending" zonefile updates to the DNS-Only servers?