I use some Nut Mini for room presence detection together with some Pi Zero Ws distributed in the different rooms. This works now for around 2 years and it’s reliable as hell, the only time it failed me was when the battery died for the first time after 7 months, since then I proactively change them every 6 months. Currently I use it only to detect if we are home or not because I haven’t found a use case for room based presence detection that couldn’t be solved easier with other methods.
What is your use case or what is your end goal?