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400mbp/s Wifi Network across very large house?

I’ve recently moved into quite a large house (From where the router is based, it’s approximately 22 meters to the other side of the house’s door) and I’ve got the M500 package with Virgin Media. This guarantees an average of 500mbps download speed. I have confirmed this via ethernet.

What is the best possible way, excluding putting ethernet ports around the house/in the walls, to get the highest possible WiFi speed across all areas of the house?

I want a single SSID to connect to at all times.

I’m aware of WiFi Range extenders such as the TP-LINK RE650, which boasts speeds of up to 2,600 Mbps, but is there a way of forming a bridge of these so that even at the other end of the house, the signal is captured, duplicated and then extended that I can get 400 to 500mbps via WiFi?

Can I simply purchase multiple WiFi extenders and put them in every damn power socket that I see?

I have a powerline adaptor in another room circa 15m from the router and that is only getting circa 50 to 100mbps.

Cost is not a problem.