Inverted nipples don't need to be treated: they aren't a medical condtion, just a normal variation.
What you've linked to won't make a physical or permanent change: if you read the text there, it makes clear that once the pads are off, unless an infant is latching on to your nipple, the nipple will go back down. This product is for breastfeeding mothers having trouble doing so due to inverted nipples.
In addition, a constant suction on your nipples is likely to be both uncomfortable and to cause burst blood vessels, soreness, possible scarring and hardening of the tissue.
While most folks don't really want their nipples obvious and sticking out all day, if you do, I know there are small prosthetics I've seen drag queens use during shows that can be worn inside brassieres.