You should add the table to the document using Document.Add() if you want automatic splitting of the rows across pages. Then SplitLate and SplitRows will work as expected.
When SplitLate = true (default) the table will be split before the next row that does fit on the page. When SplitLate = false the row that does not fully fit on the page will be split. When SplitRows = true (default) the row that does not fit on a page will be be split. When SplitRows = false the row will be omitted.
So SplitLate && SplitRows: A row that does not fit on the page will be started on the next page and eventually split if it does not fit on that page either.
SplitLate && !SplitRows: A row that does not fit on the page will be started on the next page and omitted if it does not fit on that page either.
!SplitLate && SplitRows: A row that does not fit on the page will be split and continued on the next page and split again if it to last for the next page too.
!SplitLate && !SplitRows: I'm a little unsure about this one. But from the sources it looks like it's the same as SplitLate && !SplitRows: A row that does not fit on the page will be started on the next page and omitted if it does not fit on that page either.
But as for your question: Document.Add() will only be usable if the table is not needed to be absolutely positioned. But it's seems like there is a way to do it though by adding the table to a ColumnText (it's actually a ColumnText object that does all the table splitting) and then absolutyly position that ColumnText. I haven't looked into it yet, but I will as soon as I get a little more time :)