@PFM 

Hi, thank you very much for your patience.

Please make sure the whole house is under the same electric meter which is the precondition to spread the signal via electricity.

If yes, you could have a look at Deco P9, a combination of mesh system and powerline expansion:

https://www.tp-link.com/home-networking/deco/deco-p9/

Thanks a lot.

@PFM 

Good day.

Since the powerline adapters work based on the electromagnetic wave on the electric wires, so normally if there is no Filtering equipment, like surge protector between two places,

we would consider it is under the same electric meter.

Most of the case, ring circuit, different phases, the Circuit breaker could not cut off the powerline communication.

But If possible, it would be much better you could have an electrician expert to do the final judge.

Thank you very much.