You can have multiple instances running not he same machine but request you to configure DCOM and security to avoid conflicts with user accounts connecting to DCS systems and firewall rules.
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The PI Connector for OPC UA can be installed on the same node as other interfaces / connectors. If you are connecting to a remote OPC UA server, just make sure to import the OPC UA Server certificate to whitelist it and the OPC UA Connector client certificate on the OPC UA Server. The connector is not shipped with an OPC UA client, so I would also strongly suggest installing an OPC Client, such as UAExpert, on that node as well. The OPC UA protocol only requires a single port (and possibly a second one for the discovery endpoint, if applicable), between the client (connector) and server.