You don't have 80cm between normal floor joists so installation in a regular house could be complex and expensive. If you are designing a multistory new build specifically for the elderly leaving a space for a solution like this to be installed/uninstalled in the future could be added to building standards.
PCR tests on Spanish sewer water found positive samples even earlier in 2019. I think the earliest so far French case was in early December 2019. I hope lots more studies are proceeding.