Walmart shoppers will have more ads to check while they check out Fewer clerks, more ads. | Image: WalmartWalmart is planning to plaster advertisements on its in-store self-checkout screens, TV demo walls, and other surfaces throughout its stores, as reported by CNBC. “We can deliver Super Bowl-sized audiences every week,” Ryan Mayward, Walmart’s senior VP of retail media sales for Walmart Connect, the company…