How to turn off automatic text wrap when placing images in frame

Please help!!

I'm trying to create a document that will be data merged. The data will include not just text, but images as well.

I have a rectangle frame placed over a text box, where an image of a signature will be placed (over the text of a letter). I have no text wrap applied to the rectangle frame.

When testing it by manually placing an image of the signature in the text box, every time I place the image, text wrap automatically gets applied. That's not going to work when I data merget the document.

How do I get text wrap to not be applied when an image is placed?

Thanks!