Interesting. My dad wears his on the back of the arm (posterior) not the inside (medial) - and when I asked him he pointed to the official instructions which do actually have it there https://www.freestyle.abbott/content/dam/adc/freestyle/count...
It must be a different kind of device.
Always follow the manufacturer’s instructions. Most CGMs are going on the back of the upper arm but some were put on the lower back, or other places. The manufacturer develops the CGM with a very specific placement in mind and they make sure to tell you very clearly.
No, he is correct. When I wrote this comment originally I was having trouble thinking of how exactly to describe the location