I would recommend calling them directly at +852 3184 0555 to find out what location is open on the day you are available.
At one time Model S LHD test drives were done on Saturday in Cyperport and the Tsuen Wan service center was open on Tuesdays. Current schedule has probably changed.
I've been told test drives are now easier to schedule in late June and July.
If you want to do a test drive my understanding is you need a HK driver's license or possibly an international driver's license. Worth asking what documents are required.