Fact it says alarm not sensor makes me think it is not an official document. It really does not matter where the alarm is placed sound travels well, it is the sensor which needs placing so it monitors a specific area. At 7 meters however I would have a problem, there is not 7 meters between door and any wall in one of my bed rooms, Have you got meters and feet mixed up? 7 foot would be about 3 meters.
Isn't it more to do with the alarm sound level at bed head position.
Code of Practice states: Alarms in circulation space must be within 3m of all bedroom doors and generate
85dB(A) at the doorway. Part 1 of the same standard recommends a sound level of 75dB
at the bedhead
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