There are actually special wok induction plates. The are shaped like the wok and are much closer to the real heat distribution of a gas burner. Nevertheless I don’t think that is necessary. My wok gets plenty hot where it matters and I make a killer fried rice.
I am sorry but you are somewhat wrong. My induction stove can heat my steel wok to smoking hit in 5 seconds and glowing red in 20. Induction can deliver the energy much quicker and more efficient than gas.
You still need a good induction stove top with enough power though. In Europe that is easy with 400V outlets. In North America you usually need one with a built in capacitor to get a similar result.
Both. There are stove tops available with a place for a wok as well as stand alone devices.