The Number One Takeaway from today’s training: when in doubt, install the Platform Services Controller (PSC) for vSphere 6 externally, rather than embedded.
Once you want to connect two different vCenter’s you’ll want to go external anyway. And moving from embedded to external is very, very painful, requiring reinstallations, reconfigurations, re-permissioning, etc…
Number Two Takeaway: once you go external, provide HA with supported load balancers.
Much, much more at the PSC FAQ page.