Make "grwm's" in the most organic way possible. This will require the person, playing the part, to be their natural self instead of a script. I would first create a separate account in which the person will give their honest opinion about the brand , no partnerships, nothing. This will shift the viewer's attention to the brand, and it will cause them to look up the brand's name, and people will begin talking. That's when your start making more organic videos about the product, giving the viewer a sense of relation, things that they can relate to.