Great question, SnowWhyte! I remember how very important this was to me also in deciding where to put this strange new device. You're sure to get lots of input from the crew here.
This basically all boils down to personal preference. Also, your doctor should be able to give you some good suggestions based on the feedback from his past patients. There are several here who've had the battery in the front, just as there are those who've had them in the back, usually in the hip/buttock, tucked away in the 'meaty' area.

I'm very happy with my decision to have mine placed in the left hip/butt. It's out of the way, doesn't interfere with my waist line or belt when wearing pants, and it's handy to charge. Since I'm right handed, I'm able to operate the controls with my right hand while holding the charger over the battery with my left hand until I get situated. I usually get comfortably positioned in a chair and the charger stays over the battery without me having to hold it there.

One thing to keep in mind is if you happen to lose some weight after the battery is in place, it'll seem as tho the battery is making it's way to the top, as tho it were trying to work itself out! I thought this is what was happening to me, until my doctor informed me that I was losing weight in my hip/butt area and the extra fatty tissue was 'melting away', which made the battery closer to the surface.
Now, if you are a thin person, I'm not sure how it will work in the front, or if it would stick out.

I'm very excited for you, as your trial date nears! Please keep us posted!

Caring,
Rae