I wouldn't trust penis enlargement pills. I been on hrt for 16 years and my penis and scrotum shrank drastically and just last month I had my srs and breast implants and my surgeon was still able to grant me 7 inch depth now 6 inches since the healing takes an inch away.
Not sure what's the point in doing something dangerous to your penis when you don't really need to use pills like that. Who knows, you use those pills, it might just do something worse than you expected and you'd lose your chances of getting srs ever. I wouldn't try if I were you.
Besides, surgeons, regardless how small you are, they still could grant you a 6-7 inches of depth. So don't worry to much about hormones shrinking it because the surgeon will be able to give you depth depending who your surgeon will be.