Insulation Spray Foam on long poles will solve that problem.

https://archive.ph/6zs5I :

2019-03-01 | French town installs microphones in crime-ridden neighbourhood to listen for suspicious sounds

'A French town is to bug the streets of a crime-ridden neighbourhood, installing audio surveillance devices to relay to police the sounds of attacks or muggings. '

'Audio will be analysed by computers which will alert police to suspicious sounds such as cries or shouting. '

'The French system will use American technology but will be more sophisticated, according to local authorities, as it will be programmed to alert police to a wider range of suspicious sounds. '

'Saint Etienne in central France is about to install 50 microphones for a six-month trial period. '

'The idea was inspired by a US system that uses microphones to detect gunshots in high-crime areas. '

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