Can anyone offer a recommendation for a decent powerline adaptor for Gig-E?
I've seen a few that boast up to 2000Mbps where reviewers state they can't achieve better than a few hundred Mbps. I'm currently using a WiFi repeater in that location but the speeds are awful so I want to go for a powerline device. However if I'm going to go for that solution I want one that works and works well..
Don't go with powerlines. Look into a mesh system or running some cabling to a decent wireless access point or two
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Think I'd still prefer a decent mesh setup, if your HP doesn't have WiFi you can get a USB WiFi card for like £10, but make sure it's on a cable so you can get best performance. You can also get WiFi to Ethernet if you really wanted it, depends on your bandwidth requirements (but I think the newer USB WiFi stuff is pretty decent so I probably wouldn't use it now).
the TP-link deco line gets a good write-up around here (and elsewhere) as does asus kit.
you need to decide whether you want a dual-band or tri-band setup, tri-band is more expensive but uses a dedicated radio to backhaul traffic between mesh units.. you also need to decide whether you want wifi-6 or are happy with AC. Wifi6 is the latest standard, so will give you some future-proofing, but you're unlikely to have that many devices that will make use of it today.