Create your object and make it child of the page… it will follow the page.
In this video the scale of the objects are driven by the Turn Page value.
To obtain this result you need to follow these steps:
First add a Null object and make it child of the interest page.
Reset the coordinate of that Null added.
Open the page using the control of the preset so you can see and manage the position of the Null on the page using its X and Z coordinates.
Add your own object under the Null and reset its coordinates, so adjust the Y coordinate to make the object settled on the page.
If you want to modify the position on the page use only the null coordinates.
At this point the object will follow the page turning but it will be always visible, so It needs to be scaled down when the page is not in the expose position. You could keyframe the scale of the null manually or you could use XPresso to drive the scale value by the turn value.