Re: MikroTik for the win
I've just bought my 1960s built house and am running powerline to connect APs at the moment but I've got to replace the central heating system (the lot!) so will take the opportunity to run some cat6a around the place while the floors are up.
Mikrotik have a meshing system that uses an additional 5GHz radio to handle backhaul between devices, leaving the main 2.4 and 5 free for clients. I'm sure the other meshing stuff on the market use something similar, MikroTik are just quite open about it and allow their hardware to be completely re-configured if you want to.
Biting the hand that feeds IT
