https://docs.redhat.com/en/documentation/red_hat_openstack_services_on_openshift/18.0/html/adopting_a_red_hat_openstack_platform_17.1_deployment/adopting-data-plane_adopt-control-plane#adopting-compute-services-to-the-data-plane_data-plane

In the 5.2.10 section, the example show fixedIP set only for ctlplane and internal network.
According with product manager, it seems that it should use all the IP that was used on 17.1.
So we should set all fixed IP in the template in my opinion.