The mounting of the steel guitar pickup does influence the sound of a steel guitar.
Different companies mount their pickups in different ways to achieve specific tonal characteristics.
You can change these characteristics by changing the way the pickup is mounted. To eliminate all mechanical noise and to get more of the tonal characteristics transferred from the body, you have to find a happy medium between total isolation and full contact. The configuration and winding methodology of the pickup contributes considerably to the tonal characteristics of the guitar.