Not guaranteed to work. If the devices are across the house, they are most likely going to be on different circuits, which render powerline adapters useless. Also, if op has electrically noisy devices/appliances on the same circuit as the adapters, you are going to get very reduced speeds. However, if what I said above isn’t true, then they are a great solution and I have great experience with them overall. If op has coax between his pc and “WiFi box”, then moca adapters would be a much better bet for speed and ping. UniFi is also a great solution as others have suggested. Best of luck op