Appending docx.document objs in a docx file at a specific place

I have an array docx elements and I want to place them at a specific place in a word docx. More like placing a table from one doc to another at a specific place.

[<docx.document.Document at 0x29eae1f7e00>,
 <docx.document.Document at 0x29eae1f7e00>,
 <docx.document.Document at 0x29eae1f7e00>]

Is there a way to add a placeholder in my master docx and append them?

Thanks.