Planeur Info, the official magazine of the French Gliding Federation, FFVV, has published an article about best practice FLARM use. The article describes the old Classic FLARM, but most of it is applicable to the current PowerFLARM as well.
The use of FLARM is mandatory for all gliders in France. This has been mandated by FFVV, because of the important safety benefit that FLARM gives.
The article can be accessed here (in French).