Cpanel DNS cluster and 3rd server: with or without nameserver?

I have a small Cpanel DNS cluster with two servers

server 1: ns1.domain.com
server 2: ns2.domain.com

synchronizing to each other.


My question: when I add a third server, do I have to setup a nameserver on server 3, e.g.

server 3: ns3.domain.com

or is there a way to omit the third nameserver as every domain only needs two
If yes, how should I configure the third server?

Thank you!

 

 

 

 

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