The process depends between dealers, but the waitlist for the Ioniq 5 / EV6 was managed by OEM in the beginning.
Dealers usually only take my DL and a deposit to put me on a list. Whether or not the queue is FIFO varies between stores.
I watch Hyundai/Kia content from Brantford Kia on YouTube. They advertise themselves as a no-markup dealer so maybe you can give them a call in case you're having a hard time with other stores since you're in Ontario.