Do keep in mind, should you decide to mount the Phal, that you will likely have to water more frequently than you would if it is potted.
Hmm, I would have to disagree with this statement on two fronts. First is that I have never seen this to be the case, though perhaps differences in cultural conditions make for a difference here. Second is the myth that any plant "likes" to be pot bound. If that were true, there would be a planetful of unhappy plants. Restricted root room is not a desirable condition for any plant -- even more so, it can be argued, for an epiphyte. After all, in the wild where they grow on trees there is nothing restricting root spread.
What keeping them pot bound does do, is reduce the risk of overwatering.