Bifold Mirror Door -- Adhesive Knobs OK?

Just wondering anyone's experience with Mirrored Bifold Door's and the use of adhesive backed Knobs for opening and closing.

I'm considering a cheap Lowe's mirrored bifold (24"x80") but noticed they silently replaced the plastic handle which normally screwed (or maybe adhered) into the center hinge area with an adhesive backed knob which i presume should be placed at horizontal center of the leading door. There is no mention in the docs on how to deal with this knob.

Anyone have issues with the knob eventually pulling off from the mirror due to repetitive force or age?

Thanks