Replicating GTM Configurations between HA

So this discussion seems to hint that GTM (Big-IP DNS) can be setup on HA members but that it requires that each member be treated as a separate GSLB system for a data synchronization point of view.

If that is done then these two members can be put in a HA group with a floating IP.

Trying to understand how to make the GSLB high available on a single VIP. Haven't found good information on this and consultants said we don't setup GSLB in HA-- we create separate name servers..

Thanks..