CGM/Stelo question

I now have a challenge.

I am standing here with shirt off and have pretty much no fat under my arms and just removed my expiring Stelo. It went in fairly close to my armpit...but this next one i can't find any fat

I know I could ditch the CGM - my stats are better but still not great for me to feel fully comfortable - guess I need the support; 99% time in 70-140 range and 30 day average 113 mg/dl. A1C a couple of months ago was 5.4. I have 4 untouched CGMs so I might just stop anyway and keep them back after my next blood work if it's still good.

So where do people put their CGMs and are they reliable in those locations - especially interested in people with Stelo who went all in on the resistance training and don't have the arm fat anymore.

Thank you!