I mean Maharaj Nakorn Chiang Mai Hospital, see it on the pictures above. No foreigners at all but that’s not a problem, just asked about my passport and address in Chiang Mai (no proves required) and phone number for sms invitation to the second jab. It was about 30 minutes to wait for the jab and 30 minutes after for health tracking. It was faster for Thais because they just read and fill a provided medical form without staff help. Anyway, that was easy and without hassles.