I've been casually keeping an eye on this game and it seemed so promising... However, as of right now it appears they will not allow multiboxing due to community concerns.

This is from their October 2019 developer round table Q&A:
https://youtu.be/ccJw9KwzVy4?t=525

TL;DR unless they happen to make realms that are specifically multiboxing friendly (which of course will never happen because why on earth would they bother to make servers the general player base would avoid) it will be a no-go for us. Shame really.