One of the most important components of high bandwidth and reliable wireless network connectivity is what’s between your device and the access point, and how big the distance is between these two.
A relatively short distance is, in practice, a requirement to reach close to the highest speeds your wireless network is capable of. Preferably, there should be a clear view between the client and the access point and any obstacle on the road decreases the signal strength. This is extra noticeable over the 5 GHz band.
Professional installations are often ceiling mounted. What is the benefit of this? Yes, usually the spaces are quite sparsely furnished near the ceiling, which means there are few things that can block the signal.
After reading some theoretical reasoning as well as a couple of actual tests on how to angle the antennas at the access point, it feels just as much as it is handed out to try until it works.
Since most wireless home-based routers are equipped with external round-beam antennas, the theory of the theory states that the best position is to angle the antennas so that they are perpendicular to an imaginary line between client and router. Radio waves spread out like this
That is, the waves spread perpendicularly from the antenna longitudinal direction.
However, from the actual measurements I read, you could conclude that there is no real difference between different locations. Due to reflections and disturbing objects in the room, sometimes some experimentation is required about what works best.
Basically, all modern access points and most wireless clients today support SU-MIMO. The technology behind MIMO is based on the fact that there is a certain difference in distance and hence a certain difference in the time it takes the signal to travel between transmitters and receivers.
The effect obtained from MIMO is therefore dependent on a certain distance between the antennas on the wireless devices. Therefore, be sure to maximize the distance between antennas if possible.
Something that affects performance a lot, is the immediate environment around wireless devices. If possible, place the units (and then mainly the access point) a bit from walls and objects that strongly absorb radio waves, such as cases with metal casing.