Hi there!
I would always point you to the documentation at SAS, but the HA implementation will also depend on your Grid Architecture: are your binaries shared? Are your config folders shared? Is your Grid based on IBM Process Manager, on Hadoop, on SAS Workload Orchestrator (SWO)?
1- For the first one, which I am not sure if it is the one you have, the main difference for now from earlier with RTM is about who will acting as Load Balanced - if RTM, EGO or something else. In this case, you can still use EGO, but I would rather use something else for Load Balancing.
2- For the second one, I cannot tell you much, as I have not implemented it yet. But the basics should be fairly similar.
3- For the last one, and when you have binaries and configuration shared across compute nodes. Remember, you will need a Load Balancer still: https://communities.sas.com/t5/SAS-Communities-Library/How-to-create-HA-services-with-SAS-Workload-O...