Hallo Parviz,

first you must think about your needs. Why do you NEED galvanic isolation? Do you really need it, or do you think, that this would be a nice feature?

I'm not a friend of galvanic isolation. Common mode noise, which shall be overcome by use of galvanic isolation is mostly caused or at least increased be the loss of enough ground connections, which just results when changing from ground referenced signal routing to galvanic isolation.
Symmetrical and ground referenced signal routing in combination with use of shielded cable with shield connected to ground at both ends, is the best way to handle ground noise and to reduce it. It's essential, that cable becomes part of a ground grid, an idealized ground plane, which results in least ground noise and best high frequency performance.

Galvanic isolation should only be used, when common mode rejection of symmetrical signal routing is not enough. But handling of resulting local and isolated grounds in terms of high frequency performance can be troublesome.

Bye,
Kai