The Nue switches are repeaters so if they are spread out you can move them on to HE to build a sold mesh so this shouldn't be an issue.
I find the app isn't overly quick to respond (on android) but there is a community driver that will check if your phone is on your WiFi network. If you run a unfi network there is also a solution for this. There is also the ability to combined multiple presence sensors into one to improve detection with community apps.
These should work as there are on the compatible device list.