I think floaters on a curved surface can be pretty tricky, especially if you sub-divide the meshes before rendering. Maybe I just don't have enough experience working with curved surface floaters but I would be pretty paranoid about something falling apart. I mostly use floaters on flat geometry where I know the lip will…
I think you're overthinking it a little. If it looks good in the viewport, its going to bake fine. If its obviously messed up in the viewport the bake will be messed up too. The projection angle doesn't change the angle of the mesh itself, so it just has to be flush(or nearly flush within a certain tolerance, generally…