Hello Rodrigo,
I'm sorry but I have to disagree 
To connect ECC to PI, you only need three rfc destination
two type T's (SAPSLDAPI and LCRSAPRFC) and either a type H or a type G (SAP_PROXY_ESR). Ultimately, the configuration in sxmb_adm -> integration engine configuration tells which will be used (type H or type G). So only one needs to be existing otherwise it will prompt
Hope this helps,
Mark