"spare hosts" as personal DNS nameservers for 'mynew.org'

[bind at zq3q.org]

Assume I register domain 'mynew.org' with registrar namecheap; and as an exercise,
I plan to setup my own two authoritative DNS nameservers for 'mynew.org'.

I have several linux VMs, that are under used, so I want to use them
for the nameservers for 'mynew.org'.  **Neither are in 'mynew.org';
is that going to work?**

namecheap support seems to suggest that the personal DNS authorative nameservers
for 'mynew.org', must be in 'mynew.org', as in

    ns1.mynew.org
    ns2.mynew.org

This is not what I want, since I do not want to spin up 2 new servers.

**Pls confirm, that I do not need to do this, and that I could use 2 existing
linux hosts outside of mynew.org as personal DNS authorative nameservers.**
Any additional related tips appreciated.

--
thanks!,
Tom
--

Related (Child NS records):

   <http://zq3q.org/pz/#cispa_DNS_Nameserver_NS_records_for_mynew.org>