HA Master name convention

In the Icinga documentation for HA-setups there is always a master1 and master2.
How would the setup behave if i call the master1->Zimbabwe and the master2->Australia ?
How does Icinga choose a Zone-master / Database-master internally?

Thanks for your help,

Best Regards
Nicolas

How would the setup behave if i call the master1->Zimbabwe and the master2->Australia

It would behave the same, just with different endpoint names defined in your zones.conf file (change masterX for the desired name).

How does Icinga choose a Zone-master / Database-master internally?

Not 100% sure on the answer here, but iirc, if both nodes are up and running, the one who took the IDO role first will keep it. I could be wrong though.