There are multiple teams at corporate. One of my former STLs was the head of the Sporting Goods at corporate and I want to say auto/luggage also but I could be mistaken on the second part.
Anyhow... there is a mock store that is built specifically for them to design POGs with. Not sure if that is still the case, but it was years ago. During my time at target the POGs got progressively worse to the point there it would not surprise me if they just take product dimensions, put them into a computer and see what pops out in terms of shelf space, hah. It's either that or they've cut the staffing at corporate to the point that they no longer function effectively.