Start with the preamp first, take a listen. Add other components, one at a time, as need be. Play around here. I have found that some components need this and others do not. That is things can be better grounding some and not others.
Results are a reduction in noise and potentially troublesome ground loops.
By the way, if you try mixing this idea with the one above, but you may create more problems than you solve. Like serious ground loops and other problems. Specialized after-market AC power cords for all components. All cords sound different, and one is not necessarily better than another. Each cord will force a component to react to its electrical characteristics, resulting in a behavior change in the component.