Amazon.com: DTech HDMI Dummy Plug 4K Display Emulator Compatible with Windows Mac OSX Linux Support 4kx2k 2160P 1080p for Computer Desktop (fit-Headless, 2 Pack) : Electronics
Amazon.com: HDMI Dummy Plug(4K UHD) Headless Ghost Adapter,Virtual Monitor Display Emulator Compatible with Windows, Mac OS, Linux Support 4K/2K/1080P Multiple Resolutions(3 Pack) : Electronics
4K HDMI EDID Emulator Passthrough Adapter Male to Female Coupler HDMI Dummy Plug for Computer Multi-Display Setup - Walmart.com