Effective webcam resolution

We're using GoToWebinar for hybrid lessons; we promote everyone to panelist and ask them to share their webcam. But when more people share their webcam, the quality of each webcam goes down.

I vaguely remember reading that GoToWebinar sends a cumulative 1920x960, and each webcam uses a portion of this screen real estate. So if 25 webcams were to be shared, the resulting resolution per webcam would end up 76,8px by 38,4px. (1920 divided by 25 by 960 divided by 25) Is this correct?