The best location to install your smoke alarm is in the centre of the ceiling rather than on the wall.
During a fire, smoke initially rises and then spreads horizontally. Placing the smoke alarm in the centre of your ceiling means that it is closest to all four points of your room. This ensures that you receive the earliest possible warning of a fire.
For more information, read our guide to positioning your smoke alarm and guide to which smoke alarms are best for each room.