Unbound and DNS Round Robin

[bunchofreeds]

HI,

Does anyone know if it's possible to have a simple failover using unbound and round robin DNS?
Also configurable within OPNsense?

From the unbound documentation it seems possible... assuming I'm reading this right...

https://nlnetlabs.nl/documentation/unbound/unbound.conf/
       rrset-roundrobin: <yes or no>
              If yes, Unbound rotates RRSet order in response (the random num-
              ber  is  taken  from the query ID, for speed and thread safety).
              Default is yes.

Just not sure how to implement or if it would actually work?

My requirement is a simple failover of a web GUI presented by Proxmox hosts.
Currently, each host presents the GUI and allows access to the cluster underneath. I can browse to each host directly and have this experience.
When a host restarts for maintenance etc. perhaps DNS Round Robin would resolve to another host.

I do currently use HAproxy for this so understand this approach, however I'm looking to remove the proxy entirely as I have moved to Cloudflared tunnels for my other services.
But not for this last simple fail over scenario with Proxmox.

This is not production and just my home lab. But I still strive for 'good'