I use EERO mesh network and Network Acoustics Eno filter between the EERO and the streamer (Bricasti M3 DAC with network player).
I would advise tackling room acoustics first and foremost then upgrading the components (streamer and dac) before venturing onto things like expensive Ethernet cables and filters. The most ROI will be in upgraded components and not in Ethernet or other cable upgrades. Just a free advice. Take it for what it’s worth.