So you are looking to upgrade from your 4K TV into a smart 8K TV? The TCL 75″ Class 6-Series 8K Smart Roku TV is worth a look. It comes with mini-LED backlight technology and uses AiPQ engine with machine learning to bring you richer color and contrast. This smart TV comes with Roku for streaming.
This TV comes with various HDMI, Ethernet, and other connectivity ports. It also has an audio out port. It measures 65.9 x 40.1 x 12.1″ with its stand. You can find out more about it here.