Hi kfranzen,
We do have support for add the page number in Flow model too, in which the page no can be added easily inside PDFTemplateArea using #p.
Code snippet (C#)
-----------------------
PDFTemplateArea template = ldoc.Areas.Add( new RectangleF(0,600,610,250));
TextShape txtShape = template.Canvas.AddText("Page #p; of the #P; pages");
Here is a sample for your reference.
PageNo(Flowmodel).zip
Could you please take a look at this and let me know if you have any other queries.
Regards,
Prakash.