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can a router be used behind a cupboard door
Hi @Dennis1001
Welcome to the Community!
If the main router is placed inside a cupboard door, then it may affect your WiFi connection.
You may refer to these articles that will give you some information in regards to the WiFi connection.
If there's no other way, then you might need to get an access point or Mesh network to help spread your home WiFi network.
BasilDV