as I have said, I have known several "extreme outliers" profoundly gifted" whatever you want to call them, they run in my family! they had no problems at all attending bog standard comps, ( one did attend a grammar school) They thank fully escaped all the attention and hype, no special considerations at all. They all got the top mark in their year at RG universities and went on to be the best in the world in each of their chosen fields. One died of cancer a few years ago, the others have moved abroad in recent years, due to Brexit and we are not in close contact now.
But the important thing is they are all completely normal people, with happy, successful family lives, however extraordinary their careers and their intellects are.
However famous they are, however much they invent or discover, however proud of their accomplishments we might be, their IQ has never been the important or defining thing about them, ever.
They were still taught to clean the bathroom, care for their pets, take part in sports, find and mange their own entertainments, get up and go to school on time, just like the rest of us.
I think one early exam between the lot of them, and that was a "city and guild" in a hobby, not an academic school subject.
The truly able need love and encouragement just like any other child, but not specifically in academic areas, in fact they need less there! They don't need different schooling, they don't get "bored" at school, they don't really require "pushing" - they will push themselves if they want to, they do find and develop their own interests if allowed too, they don't need flexischooling. School is enough