from what I understand this mounting magnet idea is really good because it will reduce the magnetic field perpendicular to the magnetisation direction. However I see that the mounting magnet sizes I need are smaller then whats on offer. The diameter of the mounting magnet must be no more then 10mm. Also it could be that the mounting magnet leads to forces that are too big actually. I may look into it further if the current magnets and board I am ordering does not do a good job. Thanks for the info.