There are currently 4 options for implant placement into the body.
The umbilical (currently not recommended by the implant manufactures)
The axillary (armpit),
the areola (around the nipple)
and the inframammary (under the breast) in the fold.
Each option has its advantages and disadvantages and they are all adressed in your initial breast consultation. The best option for your body type and implant type 9saline vs silicone vs gummy bear) are all factors in choosing an incision type.