I would talk to the dealer and arrange that if you have problems he'll offer a refund.
Powerline adapters are great when they work properly ..... WHEN.
There are really too many variables in house wiring for anyone to give you a sensible answer -- you'll just have to try.
Bear in mind also that they may generate noise on the mains -- possibly affecting neighbours -- so if you have hifi or ham radio enthusiast nearby you may cause them problems.