I'm currently learning about how to create branded nameserver. And I know that we need at least 2 droplets to create our own nameserver. In my brain, it must like:
Droplet A > ns1.mydomain.com
Droplet B > ns2.mydomain.com

My question is, does that mean droplet B just act as secondary nameserver? Or we also can use the resource?
If can, how do I manage 2 droplets or more under 1 WHM?

Fyi, I'm just a freelance web designer for 5 years and currently I'm trying to start my shared hosting business using DO. There was many thing that I still don't understand, but i think this is my first question.

Thanks in advanced!