I'm using Ethernet filtration and Galvanic Isolators. One in case of shock/surge/lighting and the other to filter ethernet noise. Big sonic difference when just an old blue cat five cable is compared.
I'm using two EverStar MI-300's on each system and for ethernet filtration a Telegartner M12 Gold on one system and a Network Acoustics Muon on another systems. Switches and cables are audio grade too.