probably not a problem, but if you get any missed lapped counts, then I would try to get some distance away any other electronics and mount it as close to the loop as possible... so if the loop is buried, then low and flat on the chassis toward the front of the car, if the loop is above the track, then mount the PT high, many Rx boxes have mounts above them so the PT is shielded outside the Rx box.

I've seen some cases of missed laps caused by a worn servo connector that needed to be replaced on an older PT.