It's per Wyze account.
This program is based on when you created your Wyze account. As long as that date is before November 27, 2019, you will be able to name your price for Person Detection on all eligible Wyze Cams (v2 and Pan).
What if I add another camera later? Will "Name Your Price" apply to future devices?
The email address attached to your Wyze account is used to confirm your "Name Your Price" program eligibility. You will be able to add Person Detection to any Wyze Cam (v2 and Pan) that you add, even after October 9th.