I think it’s still too early to know for certain, but this is the latest update I’ve seen about the mmwave specs.
I’d expect that 180 degree FoV is likely going to be out of reach for any solution offered currently. Even the Aqara FP2 as a standalone sensor only has an advertised 120 degree FoV. You have the upside of being able to locate that in an optimal location, but you also have to keep it powered which could be a limiting factor.
If presence detection is very important to you, you’ll likely want to use a combination of sensors and automations to cover potential blind spots.