I'm guessing you're talking about solo mining, in which case you use the LAN IP adress and such for the set-up, instead of local-host, as far as I know. As for two wallets, one for each, that is recomended, because if the computer with the wallet goes down for any reason, you can't mine. A wallet for each rig would be more redundant and reliable, and you could just wire the cash to the central wallet when you feel like it. For external acces to the rig without having to put a screen and K&B on it, use programs like teamviewer.