You have to run them as external with a sub domain. I have it running on an old dedicated machine and that is all that it does. But then we don't have that much traffic. We generate 1 to 1.5 million a month is all so far. Think it will maybe cross 2 million this winter.
Sounds like the same setup, just that I have it on a dedicated machine. Like a P3, 350 ram. Thinking about upgrading it to a little faster machine though. But this way it pretty much keeps up with the board.