I have a real estate site that contains pages specifically for agents. Every agent has their own domain name and forwards it to their individual page. The agent-owned domain names do not need to have any seo value. Currently we have about 50 domain names pointing to the site. Obviously, I dont want the main url to be penalized for having multiple domain names pointing to it. If all of the agent domains are using a 301 redirect, should I be fine? If so, could I point all the agent domains' nameservers to the same host and have one htaccess file containing redirects for all of the domains? Im just trying to figure out the easiest and most automated way to accomplish this. Any help would be appreciated.