this probably won't be a popular opinion, but i use the sticky tack stuff used for posters and the like. it's not actually "sticky" but holds its place. once the tack is covered by substrate the substrate sticks to the tack and the tack loses any stickiness it had, leaving the bottom the only sticky part. i've been using this method for a few months and no one in my group has managed to move the probe heads, nor have i noticed any problems.
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