If there was one country where people would want and be able to afford something like that, it is the USA.
Don't quit your day job to go into your new career as a product marketer. Eye roll, guys.
The market for built-in Q grills is likely limited to the people who are on this board. So basically, non-existent.
No one in the USA is going to do a built-in version of a Q grill. Which in the USA is marketed as a small, portable, tail gate grill with a retail of a few hundred bucks. Totally not a luxury product. Makes as much sense as a built-in Jumbo Joe.
If you are springing for an outdoor kitchen in the USA, you go for a big DCS, Wolf, Viking, Napolean etc. Or maybe a Weber Summit. Which (just like your high end stove inside) will have nine burners, 1 million BTUs, acres of shiny stainless steel, and tons of gizmos. And most of those eye candy appliances will be used mostly to make hot dogs or boil water.