Answering based on a comment op made in the thread:
I think there are wireless hdmi adaptors that would enable you to move a normal monitor around but seems like l lot of jank—monitor would still need power, you’d need a wireless mouse and keyboard, a table, etc. I’d say a simpler solution would be to get a normal display for your computer and then a cheap laptop to run steam link on to stream games from your main computer to the laptop in whatever room you’re in. Performance would depend on your home wifi network.
I know ( or rather assume because I’ve never actually used steam link in any meaningful way) this limits you to your steam library, but like, we all know most games are just in our steam libraries.