I offer IT support services to various businesses including a large hotel. From time to time web access in 'hard to wireless' locations is required.
I'm not pimping a product but I have used a pair of
Solwise PL-200AV for more than a year and have found them to work brilliantly... and over a much larger distance than in a normal house.
They can be affected by running too many noisy electrical devices at the same time - vacuum cleaners, hair dryers etc.