Can you be clear about your question. Do you want to know how to setup 15 servers? or Are you having problem when you install RedHat?. If you spedcify how exactly you want to do?. We are happy to help you.
Are you setting up 15 servers in your house with T1 & ADSL Lines?. You want to split traffic between those 15 servers as well?. Also what kind of router you have?. Please provide those info and we will try to help you.
There wil be so many lists will be showing up when you install redhat. As long you have your network card configure then fine. Also which will be done with minimal install for RedHat. Rest of them have to be configure with your routers.
Try with you minimal redhat installation and everything should be fine. If there is any problem post it here and we will help you out.