1. Yes, I do it, everithing ok. Realy need to add each rule into router, ex: ext_ip1:port1 -> int_ip:9510, ext_ip2:port2 -> int_ip:9510, then in conf:
{
  "rigs":[
    "http://ext_ip1:port1/mining-infos.json",
    "http://ext_ip2:port2/mining-infos.json"   
  ]
}

Page http://ext_ip1:port1 with monitoring of all rigs.

Many thanks for the help.

2. Interesting ftp with login/password, ex: http://ftp://exmplehost.com login, password, how additional-process.sh will look?
What to put on the host? index.html, lib, app?