Hi,
& a warm welcome to the forum.
I don't do contact sports. But inside the arm (opposite side to where univerasally recommended.) works fo me..
Worth a try? You would know your personal activity better than anyone...
Work & play for me .. More likely getting hit by a headstock from a guitar than a door jam..
Edit; I know
@Mbaker is into martial arts stuff & seem to remember he uses a sensor. He may have more relevant advice..