Where the mics are plugged in is irrelevant as long as they are using the best sound capture device available to you. You have to keep in mind that using more than one camera severely limits the access and mobility of the boom-op - and will most probably interfere with Production Sound Rule #1 -
Get the mic in as close as possible. Plus, from what I've read, using two cameras will make it ten times as difficult to light.
I think that you should first rethink your two camera plan. Even mega-budget productions rarely use two cameras unless it's for capturing effects, stunts and pyro. A multi-camera shoot is just asking for big-time audio complications (time & money or very poor production sound).
For production sound advice you can start with my blog; once you've read that you can come back with more directed questions.
http://blogs.myspace.com/index.cfm?fuseaction=blog.view&friendId=111888913&blogId=265521269
http://blogs.myspace.com/index.cfm?fuseaction=blog.view&friendId=111888913&blogId=187450977