We strongly recommend that a beacon be attached to a life jacket, preferably high up on the chest, attached to a strap within the life jacket.
This serves several purposes: first you are maximizing the range of your beacon, preventing false alarms. Second, if your crew does fall overboard, the beacon will float with the MOB. This will make sure the homing signal can be received by your phone, allowing for an easier recovery and rescue procedure.
Bluetooth signals can have a very hard time traveling through water, so try to avoid any positions that will keep the beacon submerged in a MOB event.
Please be assured that the alarm will always go off in a MOB event, no matter what. The loss of signal is one of the alarm triggers.