The BeaconConfigDemo application requires at least three beacons mounted on a flat surface (either floor or ceiling or along the sides of walls). The listener must be able to listen to all the beacons at once when placed under each beacon. The typical beacon operating range of a Cricket beacon is meters (with the antenna and power levels that are set by default).
Don't place a large number of beacons ( 8) within a given area as that will cause excessive contention and could increase the latency of position tracking in this demo.
Finally, if four or more beacons are used, the beacons cannot be placed such that any four of them are on the same circle (in particular, you cannot place them at the four corners of a rectangle or square).3.1