Adult Amano might be ok as they get large enough that most tetra ignore .. but RCS with most fish are almost always an issue. If you provide enough hiding places with Rocks, DW and Plants, you'll be able to sustain an RCS colony. I have an RCS colony in my 75gal full of Barbs so it's doable.
BTW .. forgot to add ... don't expect to see too much of your shrimp if they're with fish. Their instinct will be to hide .. I rarely see my RCS .. and when I do it's just a couple at a time. Almost the same with my Amano, they come out a little more often than my RCS ... even if they are big enough not to be eaten.