There are several options
https://hollandbikeshop.com/en-gb/bi.../?currency=USD
https://hollandbikeshop.com/en-gb/bi...-bicycle-seat/
https://hollandbikeshop.com/en-gb/bi...bbel-junior-6/
The Bobike junior doesn't require a rack. For the others, I would recommend something from an established brand like Tubus or Topeak and Racktime. I wouldn't trust that one from Amazon.