The Analytical Panel can be only planar. If the editing process attempts to "alter" its planarity, the system will block this action - a warning it's also displayed.
So, an analytical panel cannot be non-planar.
However, the help describes how to create a curved analytical panel (https://help.autodesk.com/view/RVT/2024/ENU/?guid=GUID-0D839F7D-3B73-41C3-8134-3FDF40B793BB).