I already have WHMCS in the same server, will I have conflicts?

Hi Guys I just got WHMCS installed on http://www.internetdenegocios.com/clientes/

I have my wordpress installation on http://www.internetdenegocios.com/

I just saw that it is better to have it installed in a subdomain. I already payed for this service and they want to charge me more to make the change,, will this be an issue?

Another question I have is can I select one of the packages I have in whmcs and add only that one with a shortcode to my wordpress website using your plugin?