Thank you @Alexandre. Laying ethernet would be tricky. I had thought about powerline, but as I only have 28mbs to start with, my experience of it previously is that you can loose over 50% of...

I currently have 3 Deco M5s, with no ethernet backhaul. These work brilliantly in the house, but the signal to my garage (where I have a security camera) is really poor. I moved one of the deco's...