I installed the plugin and when I start it I can see this in the logs (debugging on):

2018-09-16 12:17:58.558 (MIF2) Number of devices found via bluetooth scan = 1
2018-09-16 12:17:58.559 (MIF2) Creating new sensors
2018-09-16 12:17:58.559 (MIF2) Creating new sensors for Mi Flower Mate at C4:7C:8D ...