In our test environment, there are three nodes clustered with the control plane, master, etcd roles respectively. We intend to use traefik and Metallb for ingress and internal load balancing. Furthermore, Rancher management for this cluster is desired. One nginx external load balancer will be utilized for the k3s cluster and another for the Rancher management cluster. Are we on the right track? If not, help us in setting up the environment.