From my perspective (look after 57,000 social dwellings) The need for these is more common in social premises such as sheltered, supported and student accomodation in particualr HMO's etc.
Unfortunately the reality is that the social sector doesn't have the money to spend on retro fiiting this kind of system due to cost, maintenance, and malicious activation (which is highly likely)
There is some financial assistance from certain brigades/government departments etc to encourage the installation of these, but as a large company we do not qualify, despite the quantity of people we look after.
There may be a demand from my sector in the next 5-10 years, but at the moment the reprocussions of the RRO are still moving through the business. We will undoubtedly have money to spent, just not for a considerable time....