Here and now beacons

I a new to beacons and need some help. I set up some of these to do a demo and experiment.
Beacons power level were set at different strengths and I tried to test them. The notifications did not appear as I had expected. I’m not sure if the power settings had something to do with the performance.
I wanted to see if anyone else had experienced anything like this.
anyone have a basic idea of how to set these up?
I changed the power settings to see if these could be used in a car sales lot in different vehicles,

Any help appreciated