I find that if I position the cursor within the text, and paste an image, then the Object Placement is anchored within the text stream, and defined as
Move With Text. This is in Pages 10.0, which is current at time of writing.
The same is true if I drop an image directly into a paragraph of text, or use the menu item
Insert > Choose... at the cursor position. So that's half the requirement.
There doesn't seem to be a way to set the default Text Wrap style, nor to select all images at once (short of Command-clicking them all) and then setting the wrap style.
However: one method that does seem to work:
- Paste all the images into a blank, 'spare' Pages document. All the images need to fit on one page, so make the page size very big.
- If the document contains nothing else, you can Select All the images, and then define their characteristics in one go.
- You can then copy and paste each one into your target document, and their Text wrap style will be preserved.
From posts on other forums, e.g.: https://discussions.apple.com/thread/7223123 , it does seem that this function does not 'formally' exist in Pages. The AppleScript Dictionary contains only one reference to text wrap, but in the context of tables, not images.
Ultimately, if this is a major impediment, you may be more productive in another application.