Node is controller. HA pair always has two controllers (nodes), in your case in the same chassis. To get transparent failover between two locations you need metro cluster, but metro cluster is not possible with FAS2xxx. Alternative is host-based mirroring (simply allocate storage from both HA pairs to VM and mirror on VM level).
It depends on your objectives, and your budget. If you want "continuous" availability, use FT in vsphere, or application level continuous availability solutions. If you want synchronous replication between rooms, or between sites within a metro area, consider a metrocluster solution. If you want DR to a remote site, use snapmirror and evaluate tools that orchestrate the recovery workflow at the DR site.
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