You would probably be better off using a wireless pir in the required location then lighting from your apartment. But a cheap led light probably won't cut it and you will likly need a narrower light output.
Mounting to the cladding has issues anyway ie grenfel but a decent fixing will be another anyway
As above its not a worry, but if that concerned don't use them at all. But if you have them there is an input to disable the microwave. It's a popular Israeli detector