Curved-bottom woks work best when placed in a wok ring: a round collar that holds the wok over a burner (typically a gas ...

so this type of wok needs to be used in tandem with a wok ring. The wok ring is a metal support that will stabilize the wok ...

Gas favours round bottoms when sat on a round ring that sits on the stove's trivets (although many have built in wok-rings now). You'll generally find the hottest point is right at the bottom ...