FindMe from KLICKfix makers Rixen & Kaul is a simple holder that is screwed onto the standardised threads for bottle and tool holders. It consists of two halves that are pressed together when screwed on. A sealing ring surrounds the AirTag to prevent water from penetrating. Two special screws with a modified M5 hexagon socket screw head and a suitable spanner are supplied...

... Two special screws with modified M5 Allen screw heads and a matching key are supplied. If you simply attach FindMe to the frame, it is very conspicuous. It is better hidden if you mount it between the frame and a bottle cage or tool holder. This should work in most cases because the housing is quite flat. However, if you look closely, you will also discover the holder under a bottle cage.