My advice here, whatever you go with, is don't try to cover all of those with one can. The big bore suppressors universally suck with high velocity small bore rounds, our own models are no exception.
Your .50 cal options for the Beowulf are pretty limited, only production one that comes to mind is the Bowers VERS 50, which is a monstrous aluminum thing that frankly does not impress me, especially at the price point.
I think Rex will bore for .50, and we can also do that with our Accipiter model. But in either case, you're looking at fully welded all-stainless cans, which is a consideration if you plan to use any cast bullet loads.
For the .30 rifle can, lots of good options. Obviously I'm partial to our own models, but there are many quality suppressors to cover your .30 cal & under needs. It can be narrowed a bit by prioritizing between length, weight, suppression requirements, diameter constraints, mounting preferences.