ARW was thinking very hard :
I have something similar to do but not at the price of the CPE510.

TBH I was considering using a socket wifi extender. Possibly something from
here

https://www.bgelectrical.uk/wifi-sockets

All I want is the next door but one neighbours to have access to my wifi. And
there is a good reason for this.

I think those wifi sockets use mains signalling, so unlikely to work
outside the same property.

Make a pair of these -
http://www.iw5edi.com/ham-radio/4026...0-el.-yagi,115

then modify a suitable pair of wifi routers, to use the yagi antennas
in place of the built in antennas and you will have a system able to
provide a link over several miles LOS.