I have a Note 5, so far yes, it does work in the background. I just removed the app and reinstalled, so far so good. I don't want to say it will work 100% for you and it not work. But I am happy to answer any questions you have. I need to do some more reading on that Escort/Droid forum.
I can say on Friday, I had Pandora, Waze, and EL running and it popped up the alerts.
I can say on Friday, I had Pandora, Waze, and EL running and it popped up the alerts.