Suggestion 2: Don’t stuff your router in a cupboard
Routers may be ugly, but that doesn’t mean you should hide them behind the TV cabinet. If you want the best signal, you’ll need it out in the open, free of any walls and obstructions. If your router’s optimal location is a space without a table or flat surface, check to see if you can wall mount iteither using its pre-installed mounting holes or a third-party mounting bracket. Point the antennas perpendicularly (if you can), and elevate the router if you can (one reader found that his attic was the perfect spot). Lastly, make sure it’s in the center of your house, so you have the best coverage possible throughout your home.
Wi-Fi Signals Don’t Like Physical Barriers
How problematic a barrier is, depends largely on the material, which you can read more about here: How Building Materials Affect Wi-Fi Signals.
Therefore, the best position for any router, extender, or other wireless access point, is:
as centrally as possible in the area it should cover
not behind or underneath anything.