Help/Confirmation with Dnsmasq with IPV4 Forwarding Unbound

[smajor]

I am not a DNS guy.  I'm struggling with these instructions and need clarification:

https://docs.opnsense.org/manual/dnsmasq.html#dhcpv4-with-dns-registration

I own my own domain.  Instead of lan.internal, shouldn't I use my domain instead?  Because, if I setup the way of the instructions, all of my internal clients get the name computer123.lan.internal when they should get the fQDN like computer123.mydomainname.com

This is just a sanity check for me, I'm pretty sure this is what I want.

[Netlearn]

There is a note in that link to the docs. I think that is what you are missing: zone, then hosts.

Note:
.internal is the IANA and ICANN approved TLD (Top Level Domain) for internal use. If you instead own a TLD, e.g., example.com, you could create a zone thats not used on the internet, e.g., lan.internal.example.com.