It will usually be used as a computer monitor and Security Camera Monitor as well as a TV which is why it would be helpful to have picture in picture capabilities
I am looking for 4K resolution with HDCP compatibility, with 120 Hz or greater refresh rate, HDR Compatible, preferably with 4 HDMI Ports, Mirroring Capabilities, Supporting Blue Tooth and WiFi capabilities, multiple USB Ports, Headphone Jack, Sleep Feature and Audio Outputs.
The only brand that has PIP to my knowledge is Samsung and that only functions for the built in tuner and one input. It doesn't work on two inputs. Adding one of these may do the trick. https/www.amazon.com/CSRET-Selector-Wireless-Switcher-Switches/dp/B019510V30
If you are going to use it as a monitor then the TVs ability to turn off the overscan will be important unless you computer allows you to adjust the height and width of the desktop.
All TVS support HDCP. If they didn't they would be useless.
HDR compatible doesn't mean that the TV does a good job of displaying HDR content.