Thanks @OtakarKlier for the info.
That is actually how I was originally planning on doing it but I ended up liking the suggesting of creating security zones for the other site-to-site configs we add. They can all use the same public IP (and associated loopback that I use for the floating IP HA part) and then everything else is different. I feel like this gives me some extra control and options when designing security policy and with 900 maximum security zones on our platform I don't have to worry about running out any time soon.
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