Using a seperate webcam will give you more control over angles, lighting, backgrounds (real ones,not virtual) etc, so they are well worth it. I’m running a Poly EagleEye mini that’s usually perched on a monitor, but occasionally gets moved to a tripod for webinar presenting. All the major packages like Teams, Zoom, Webex pick it up without any issues.
Get it positioned so that the presenters top half and hands can be seen by attendees, as this is more natural than just seeing the head. And don’t forget to sort out audio as well – discrete headset like Poly Voyager 5200 – as you may be further away from the laptop mic and speakers