I use these https://www.amazon.com/Patches-55-Transparent-Waterproof-Overpatch-Tape-Days-Without/dp/B08QGFLYC2/ref=mp_s_a_1_4?dchild=1&keywords=freestyle+libre+sensor+covers&qid=1629846775&sprefix=freestyle+&sr=8-4
They don’t budge, like at all.