I am not sure about if the issue is a MAC OS one or not. However, if it does require a constant plug in, you might consider: https://www.amazon.com/Display-Emulator-Headless-Display（Fit-Headless-1920x1080-3840x2160/dp/B06XSZR7CG/ref=psdc_14570285011_t5_B074FT1P8M.
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