Domain Clustered Mode and Admin API

If I am running Keycloak in a domain clustered operation mode, I wanted to understand 3 things:

  1. Where (domain controller/host controllers) should I send Admin API calls to for example create realms or manage users/groups?
  2. Where (again domain controller/host controllers) should the authentication requests go?
  3. Would the host controllers act as load balancers to the keycloak server instances they start?