This receiver is used if there's one or more magnet stripes in the track.
The magnet receiver gives precise lap times but is sensitive for mechanical affections. If there's an active AMB loop build in the track we would recommend a loop receiver instead of the magnetic receiver. Most tracks has magnets but it's not all with active AMB loop.
The receiver is mounted directly on the floor plate typically right in front of the steering column. Mounted on the place on the floor plate where there's the least vibrations