We currently have 2 PA 500 which are currently configured for HA. But don't think its currently setup correctly.
This is what I can find regarding as to what we want to achieve.
Active passive with OSPF
But the above article doesn't really make sense, like on the widget display it says HA peer's IP used is 184.108.40.206 and 220.127.116.11.
What exactly is confusing you in the document you linked to?
As for the IPs, if these units are directly connected it doesn't matter what IP you are using; the documentation should have used RFC1918 addresses in its example, but a lot of older docs used 18.104.22.168/8 addresses as it was assigned for research for the longest time and didn't actually matter. In your environment, these IPs should be something local to your environment.
I would not make them the same. It is there to prevent split brain.
I have preemption disabled to prevent a flapping scenario. If there is a failover event, I want the standby unit to stay active until I can determine why it occured. In the older code and models, I had it enabled and it caused a flapping where they would see a failure and constantly flip back and forth and cause downtime for me. It was a weird scenario that I have only faced once however.
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