I place mine on my buttocks, a little above my sit bone point. I too and using the Sandoz patches and they stay on 99.9% of the time. Once in a while, I have one stick to my panties and peel, but I figured out why. I have been using them for almost a year and a half and found that there is adhesive that has worked in to the weave of the pantiel materiale. It will stick to the outside of the patch and that starts it to peeling on the edge.
My endo explained that the buttocks are the least 'sweatish' area and so the patches tend to stay put, even with heavy physical activity.
Just my observations and experience.
Congratulations, BTW!