I did that initially at our rented cottage last year using a Billion 7800N router in bridge mode, so in effect it creates a second bridged network. The downside of this kind of setup to that it is seen as 2 separate LANs and Wi-Fi gear can get a bit confused moving between the 2 zones. I didn't find it very fast or that reliable so purchased the power lan adapters. So much easier and at the time I was getting about 55Mb/s directly at the router via ethernet, and only just under that using the power supply lan adapters. I highly recommend you get a couple if you see them on offer. It makes a huge difference.
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