Hey Curious, good question - for the purpose of bed leveling for your printers. With our sensor the position of the print head in respect to our sensor is not relevant, since we are measuring distance from a height above the bed plane. As long as the sensor is attached to the magnetic strip and not perturbed on purpose during the bed leveling procedure....Also to be noted the provided magnetic strip is industrial class and one has to really try hard to make it move from its position. It is one of its first kind so i totally understand your misunderstanding - with our device you wont need two different leveling technique for sure!
Hope it clears the confusion. Let me know if you have further questions!
And please suggest ways to get the word out to more people to make this project sucessful!