Clay pots are good, but they aren't necessary to stabilize a plant.
If you use bark or CHC chips, 6" aircone pots are really wonderful for phals.
Aircones are clear plastic pots with an "aircone" in the center to help aerate the center of the pot, which can stay too wet.
The pots are square and very sturdy, also not easily tipped. If you "lower" the plant by cutting off any rootless stem at the bottom of the plant, the 6" aircones will keep your plant steady and it will not tip. The 6" are supposed to be strong enough to stand on (no, I haven't tried it)
FYI, I burn about a dozen extra holes in the bottom of 6" pots for phals because the pots are so big-- more aeration for the roots. The phals in pots with extra holes do better.
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