I'm not sure what you mean by alarms that 'come from device'. I frequently have alarms associated with tasks. ~95% of the time, the alarms are set in Outlook and synced to you. Even if the alarm were to be set on the app, it would still be syncd back to outlook and later sync back to you.
For example, excluding today (I've addressed the 2 tasks with today alarms) there are 2 tasks up to including Thursday that have alarms.
I would guess that during a given week I have 2-4 alarms set at any given time within a 7 day window. There are a lot more if you were to include all tasks--some of which may alarm a year or 3 out.