A simple Faraday cage completely surrounding the router would have solved that problem.
Or a tinfoil suit.
Could be - someone suggested to me that it might be useful if you had a kind of display unit that was designed to be set on top of an overhead projector unit - though I’ve never seen anything like that, and I don’t know if it would need to be mirror-image.
This was 10-15 years ago and I still crack up when I think of it. I used to write backwards as a hobby / joke, and I think it was Og’s way of getting back at me.