8:30 reg, no late reg, would be the better option, I think.
This week I was providing childcare over in Pudsey so joined just before 8:30 and played the first 25 minutes in the car on my phone, while Mrs McG drove. Mind you, looking at a smaller screen, and wearing no spectacles, made for an interesting short session.
I don’t think I intentionally join late, but I am conscious that my starting time has become later and later over the years, and we all know that Leo will join with a few minutes to go due to his other commitments.