Please read this comment, with the link from XDA Developers Forum: Mint Mobile on /e/ vs Stock Android - #14 by egx470
It talks about how it will be nearly impossible to get VoLTE running on Samsungs with a custom ROM.
If you’re planning to use those Samsungs within the U.S., you won’t be able to make or receive calls, because 3G is shutting down across the country. (Unless you rely on a 3rd party application for calls and messaging.)