Or if the TV carries a USB3 port get something like this https://www.amazon.co.uk/gp/product/B00NPJP33M/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
My LG just went from its native ethernet limit up to 160Mbps.
Batman Gotham by Gaslight (being the highest bitrate I have) now happily plays back on my LG without any hint of a buffer.
Its still gonna be the ATV 4K as my default, however I can now play all Dolby Vision files in Plex on my LG 
