Where should I place my sensors for my VELUX ACTIVE?

To obtain the best conditions for accurate measurements, place the VELUX ACTIVE sensor according to the following guidelines:
  - Place the sensor in reach at a suitable height on the wall (36" - 48")
  - Do not place the sensor on the inner side of an exterior wall
  - Do not place the sensor in direct sunlight
  - Do not place the sensor above heating elements or radiators
  - Do not place the sensor behind curtains, furniture or other obstacles