On a flapped ship, my personal preference goes to a magnetic switch installed on the flap control rod. On my Arcus, it is made of a mag reed switch and two small magnets.
Then the computer must be setup appropriately (NO vs NC switch, correct remote switch input).
You may always change the setting in the computer, if later you find that automatic based on airspeed is better suited to determined situations

Aldo Cernezzi