Ottawa is 13 hours behind Taipei
There is no standard 8-to-6 overlap. Someone joins early or late.
Given Ottawa is 13 hours behind Taipei, the realistic answer is that there's no convenient shared slot during normal business hours. Catch the edges of the day: the last hour for Taipei or the first hour for Ottawa is usually the least painful option. The window above shifts seasonally: Ottawa keeps daylight saving while Taipei ignores it.