I couldn’t make my outdoor patio Sonance Mariner 64 speakers play audio from outdoor Samsung TV with Sonos Amp located in the house.  I tried J-Tech and many other extenders and received an error code on the Sonos App that CEC was not working.  
 

Setup:  Samsung 75” TV HDMI ARC out to HDMI receiver extender, Cat 6 out of extender to transmitter in house next to Sonos amp, HDMI out of transmitters to Sonos amp.  Also had bidirectional IR to control volume through Directv remote.
 

Solution:   ARC HDMI Extender 4K@60Hz 4:4:4 HDR10 Over Cat5e/6/6a/7 Cable, Audio Return Channel, S/PDIF Audio Pass Through, HDMI 2.0, HDCP2.2, CEC, PoE & Dual IR, RS232, Atmos & DTS:X https://a.co/d/c8X1IBN