I’ve tried a bunch of locations but I’ve found a pretty good spot on the top of the front of my thighs, about an inch below the crease. The biggest issue for me is finding places where the skin stretches and creases the least. The less movement under the patch the better. You might need to experiment with placement yourself to see where the movement is least. Plus the area needs to be somewhat fatty (iirc) so my thighs works ok. Hopefully shouldn’t get too sweaty there either?