So, this I can answer.
We did 4 of our 6 yesterday. It was not clear if one email was possible or not, so everyone used their own email.
One warning, one of our tests came back as "not valid" so we had to quickly schedule a rapid at Quest, and that was yesterday, and still no results. Hoping for results today, sail tomorrow.
The test process itself was simple, and each person started their own call. There was no waiting for the testing session to start.
I am praying that the other 2 that test today have no issues. At some point, we may have to have the one retest again if no results from quest come back.
The three that tested, tested easily and results were in email within minutes. I printed the results and uploaded them to Verifly and approved within a few hours.