Yes, on laps/stomach. In VR mode, almost all these work-oriented apps have a concept of "desk view" or "portal" - i.e. window into "reality" to show keyboard. Meta's Horizon OS detects and shows physical keyboards automatically I believe. But a lot of time, I just use Mixed Reality mode - so only my screens floating in the corners of the room are rendered on top of "reality". If you forget that you're in VR goggles, it's the same as just lying down and working on huge screens on your ceilings or walls.