you want an active beam for detection. Take a look at the takex or Optex units. I don't like voice diallers as they are not polled a proper monitoring transmitter would be better imo
Im afraid nothing will work as a zone splitter. If you have the cores then you can go more conventional and use eol. If not your looking at an addressable tech like hkc
bear in mind that if using wifi and you loose power you will probably loose your WiFi and internet connection unless supported by a UPS
some of the app platforms support polling though