Thanks for helping my situation. I'm using TP-Link AC1200 RE355 wifi extender, I have tried the set up you suggested, as 2.4 ghz for air backhaul, and 5 ghz to "serve the clients". I got about 40 mbps now (using speed-of-me website). I'm now looking for a powerline to give it a try.
I'm now interested in the powerline/wifi extender adapter kit. I have do some research and find AV2000 type can achieve 100 mbps. Will it behave more like wifi extender or wired access point? I have tried the Linksys wifi adapter, and it keeps saying the range is too close to the router; and...
I want to buy a wifi extender, and my real internet speed is about 100 mbps. My router have a good range in 2.4 Ghz, but not doing well in 5 Ghz. Will I get that speed through my wifi extender? Or I should invest in mesh system later? I think mesh network will be overkill for my place.