Melbourne is 2 hours ahead of Taipei
Best overlap: 8:00 AM to 4:00 PM in Taipei is 10:00 AM to 6:00 PM in Melbourne.
Plan around 8:00 AM to 4:00 PM in Taipei, which is 10:00 AM to 6:00 PM in Melbourne, to catch everyone during office hours. The overlap is wide at 8 hours, so you can protect mornings for deep work and still find plenty of meeting time. For part of the year the maths changes: Melbourne observes daylight saving, Taipei does not, shifting the overlap by an hour.