Sportopia Cycles - Computer mounts on a TT bike might seem like a challenge. The Barlfy 4TT mount makes this very easy. The unit comes with mounting adaptors for most bicycle computers
Garmin Mount for TT bike -
BETWEEN-CLIPS GARMIN EDGE MOUNT FOR TT BIKE
The special equipment of the Tour de France time trial | road.cc
AeroCoach TT computer mounts (Garmin & Wahoo)
TT mount 3.0 - The leading computer and device mount for TT bars – 76 Projects