Matt, you said
https://www.thecablecooker.com/how-does-the-cable-cooker-work/
"I will plug a space heater onto it for a month and let it burn in."Considering your future is likely to include trying more equipment and presumably also cable changes, why not purchase something like the Audiodharma Cable Cooker so you can condition your cables over the course of a few days, instead of a month with a space heater. Your first task for the cooker could be to condition the Romex you plan to use in the wall, as well as the GTX outlet. Just a suggestion.
https://www.thecablecooker.com/how-does-the-cable-cooker-work/