SSH tunneling is needed if you have set up a full node on a machine different than the one you are running WordPress on, i.e. for the connection to the JSON-RPC API of Bitcoin core and friends. (for more, see here: https://en.bitcoin.it/wiki/Enabling_SSL_on_original_client_daemon )
It is not needed or recommended for the cloud wallets.
I do not have plans to integrate the plugin with GoUrl.