Your plant looks great. I have Phals that grow horizontal, I just stake the spikes up - they start up pretty well anyway. Some people mount them, but for now I'd just let it do what it wants. In fact some people mount them with the crown pointing downward and they do great and don't get water in the crown - the spikes are allowed to grow downward and out and they look great.
Here is a picture of my Phal Black Jack getting a soak in the sink. I think you can see it grows sideways and is a big, old, happy plant!