Estonia being marketed as 0% tax is one of the biggest scams in this industry. It's true until it's time to distribute profits. Then you're facing a potential net 25% tax bill. Sure, it might say 20% on distribution but if you read the fine prints, you'll find the 20/80 rule. There are use cases for Estonia, though, of course.
Unless you're comfortable committing
tax evasion in Canada, it might be too late to take action if the deal has to go through quickly. You're tax resident in Canada and will continue until you stop being tax resident, which doesn't necessarily happen the moment you get on a plane. Earliest is probably sometime next year. Check your situation:
Determining your residency status - Canada.ca