The indicated adhesive force was measured perpebdicular to the surface to which the magnet shounld stick. It takes a lot less strength to move the magnet sideways. Therefore, you can strain a pot magnet much less if you use it on a wall as opposed to using it on the ceiling.
NdFeB Flat cup magnets are mafe with strong neodymium magnets embedded in a steel pot. they have a higher adhesive force than countersunk pot magnets because the contact surface is larger. The steel pot increases the adhesive force of the magnet on direct contact with a thick iron surface. If there is no direct contact with the counterpart, or if the steel plate is thin, painted or rough, you can strain it much less.
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