WHMCS remote host on same host?

I am just wondering how to integrate my WHMCS installation with the WP integration plugin, the "remote WHMCS host" is the same as where my WP is installed, albeit in a different directory - should I just put the hostname in that field? Is it a bad idea to have them on the same host, should I be using a subdomain or something? My license is for my domain and so I was thinking that my WP install should be on the same domain - would appreciate some best practice advice.

Thanks! Ingrid