That Westcott 3-flash bracket looks like a decent option.

One thing I always disliked about the Westcott Apollo's (and similar) designs was that you couldn't tilt the softbox at extreme angles

However, I like this solution for fixing the issue (it also has two flash brackets and positions the the flashes so that they are pointed directly at the center of the softbox). It's not cheap, though. I think you could likely make a DIY solution for less.