12c EM Cloud Control Design

We have 2 sites for e.g. A and B, separated by 500 Miles. 2 systems in there, one has Data Guard setup, replicating data in performance mode, Async. This is a single database instance managed by Oracle GI. Another system is a 2 node Standard Edition RAC/ASM and it's data replicated via SAN replication to site B. We wanted to manage both systems via 12c EM Cloud Control, without having a 3rd site C. Both systems are in 11.2.0.4, Linux 6.x.

I'm trying to come up with a design such that even if one sites goes down, minimal actions are performed in other site to get EM to monitor the targets which gives a sort of HA. Idea is to have EM/OMS per site and have respective site's target register to both sites OMS.

I believe targets can register to multiple OMS's Or is this even possible?

Any other ideas/suggestions are appreciated as well.

Thanks
Steven.

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