The RT-AC68U is a good unit. if you have a couple (or more), you can use their AiMesh firmware to give you continuous, full speed coverage through the house with the use of repeaters. You have a choice of Ethernet or 5GHz backhaul although, for the best speeds, Ethernet is better.
I have 3 units, one on each floor and I can get good speeds from Wifi everywhere e.g.
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