If your nodes are accessible from the outside world you can get away with just hostNetwork: true, there are some potential issues with it though (ie. just one pod per host or potential port conflicts with other stuff on node). You don't need any service defined for it, as it will just listen on your nodes ports (need to have them open on firewall, security policies or whatever guards your nodes from external world).

Any use of service (except for maybe headless one) will result in a loadbalancing between all backing pods (be it ClusterIP, NodePort or LB), but only LB service will give you a dedicated external IP.