Best available trade in option for adding new line

I’d like to add a line to an existing Magenta First Responder plan.  What is the best available option to bring a line and trade in a device?  It seems like Google Pixel 7 has a good trade in value for one of the deals but it requires Magenta Max.  In another option it shows $400 off but doesn’t list the Pixel 7 as an option.