I tried and failed with a variety of solutions in the UK and ultimately discovered my house has different unconnected ring-main power circuits, so extenders that send the data signal through the earth wire of my AC power supply don't work to my outhouse building containing my 'observatory' ( converted garage). Adding to the frustration, my well constructed solid brick house is internally insulated with plasterboard (gyproc) lined with reflective metal foil so it is a bit like a Faraday cage. Regular WiFi extenders struggle with this barrier.
I then purchased the latest BT WholeHome MESH disks. One connects directly to my router creating a new 802.11ac 5 Ghz network.. I then installed two other discs to form a wireless 'mesh' (grid) to reach my outbuilding and embrace garden and scope location. Even so, to get a signal rated "excellent" I had to locate these in a L shaped pathway to get round some obstructions. If I put them in a straight line shortest distance the obstructions are too great. The disc in my observatory is so sensitive to this, if I move it merely 6 inches the signal drops from "excellent" to "poor". Rest assured it is screwed down at a height where it is secure from knocks.
I work (part time) in professional cricket and there we use point to point WiFi to transfer broadcast video data (like the Ubiquity units described in a on earlier post". These work great up to a kilometre. But need a clear line of sight. A car parking between the transmitter and receiver or even a group of humans standing in the path will block the signal. Humans are 60% water, so not a good conductor of data.
In summary, don't assume any solution will work out if the box. In some situations you probably have to tease out the best performance by trial and error regarding location, and straight line connectivity might not be the most effective even though it is the shortest distance between devices.