If your goal is to achieve optimal Wi-Fi signal quality, it is recommended to follow the following tips.
Place the router in the center of the geometric configuration of all devices that will be connected.
Try to reduce the number of obstacles between the router and the devices to a minimum, especially walls made of reinforced concrete, which are very poor at transmitting the signal.
Avoid concealed placement of the router inside furniture or metal containers so as not to limit the free signal propagation of the antennas.
Check that there are no sources of interference near the router, such as bulky furniture, in the signal propagation path to the devices.