If the flange is setting above the floor, then one wax ring should do it.
If the flange is slightly below the floor, we use two.
The roughness in the trapway works better then a smooth trapway.
It's impossible for a baby wipe (which shouldn't be flushed) from sticking to the roughness of the trapway. If it' smooth, then things will stick to it.
Imagine throwing a baby wipe at your bathroom mirror, it will stick.
Then throw in on a texture wall and see which one falls quickest.
We've sold thousands of bowls that look like that, it's the sweep before the outlet that makes the difference. The sweep points the waste down the drain.