Hello MorganP91,
Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions about building into Constant Contact's API.
Our inline sign-up forms are currently only able to have the contact fields stacked, however, I have tracked your account on an open feature request for the ability to place the fields side by side as you described.
Please let us know if you have any other questions!
Regards,
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