Serious question: how do you even measure AI SEO?

I get how normal SEO dashboards work, rankings, impressions, clicks, all that. But with AI search answers, people often get what they need without clicking anything. So my question is, how are you even supposed to measure visibility now?

And are people tracking mentions or citations instead? I’ve seen tools like Prompwatch, Profound, Peec and many mroe mentioned but do they really work? A colleague of mine tried some alternatives but said that the LLM citations all show differntly which should mean they're not accurate right?