[zorp] TPROXY with iptables nat??

Hi, I'd like to ask You a question. I'm now using tproxy aplication with my own nat inside, but I'd like to know, If I can add tproxy after normal nat from iptables? If so, can You please give me any example how to set the iptables? -A POSTROUTING with -j TPROXY is not accepted by iptables. Thank You very much. Regards, Jakub Bednar