I have several baskets planted with multiple phals. When it works, it works great. A beautiful full display. When it doesn't work, it looks even sadder than a single sad plant.
Using identical plants so their bloom is in synch is the best way.
Remember that you will use a larger pot or basket, so it will stay wet longer, and when you have to repot, they will be intertwined.
I have two the same Phals potted together - they came that way, and didn't seem to want to come apart when I repotted, so I left them together - both are doing great, and I ended up with a total of 6 spikes blooming at the same time