Usually you get one on the open NAT (aka the DMZ) but the rest would be normal clients. More NATs from what I know would need more internet IPs addresses which could be costly.
Why more than one open NAT? You didn't tell.
i have atandt uverse and was told by them that their router/ motem could not handle it so we bought the nettgear nighthawk r7000 and was told that it should be able to run all three with open nat types. it cant or so it seems. ive looked all over the internet and it has led me to forums. both att and xbox support were unable to help me. any and all help is greatly apprciated