Multi-node plug and HA

I would like to use Orchestrator in the following ways:

Within a given site, I would like to have more than one Orchestrator instance, so that if one instance goes down, another one can take over.

At a DR site, I would like to configure an Orchestrator instance to operate workflows that normally would be operated by vCO in the primary site , if the primary site experiences a disaster. 

Does the multi-node plug in accomplish both of these goals, or is it just for repliaction to a DR site instance of VCO?

Thanks!