Folder Setup

[MiRai]

I plan to use a single computer and ISBoxer.

Well, then I guess there's no need for dicking around with symlinks and all of that mumbo jumbo.

1. Do I need multiple WoW directories or should I use Symlinks with the new Battle.net Launcher?

WoW doesn't require you to open the game through the launcher, so any multiboxing program can still open up multiple game clients by simply executing the exe file multiple times. However, if you want to use the launcher, then, since you've already stated you'll be using it, it's easy to do so with ISBoxer.

2. Are there any advantages/disadvantages of each of these methods? What methods do you prefer?

To my knowledge, nobody's ever benchmarked it per se, but there's this page on the ISBoxer Wiki.

3. Is there a way to setup WoW (like with the trial versions) and ISBoxer to see if everything is setup correctly before dumping the money for 4x copies of WoW/Legion?

The exact same way you'd play a retail account, as the process for logging into an account is the same regardless