If you want to watch the same content across several screens using an HDMI splitter you might worry about signal degradation.

While the USB-C port available in most modern ... first ensure that the input and output devices are connected properly ...

In this case, a three-port HDMI switch is used with three inputs for source components and one HDMI output to the TV. When multiple TVs are used, there are HDMI switches with two or more outputs.