You choose the Form, Sequence, or Tag you want to connect your Acuity customers to, and also select the opt-in question so it is clear that you have their permission to add them to your email list. But you can only choose one location for your Subscribers to go.
A workaround is using Zapier, you can check your options here: How to connect Acuity Scheduling + ConvertKit35
I hope it helps. If you're still having issues or need further assistance you can always reach out to firstname.lastname@example.org.