Thank you so much for your answer and the picture! Now I got it!
I didn't know that you numb two nerves. I always thougt that only the cutaneus femoris lateralis is damaged when you have meralgia paresthetica. I didn't know that the femoral nerve is affected, too. That explains why I have pain in the front side of my leg, too.
I've placed my two patch pieces on the areas you've marked in your picture. I'll keep you posted how it works!
Thanks a lot!!!