iPAD Pro 10.5

The library has a number of Ipads, but I don't know their size or year: https://grabcad.com/library?page=1&time=all_time&sort=recent&query=ipad

If you feel compelled to purchase it, then a site like Turbosquid likely has one. Just make sure it is available in the file format you want. Many of the files there are anything but IGES, Step, or SolidWorks:
https://www.turbosquid.com/3d-model/apple-ipad?synonym=ipad

It is a 176 page PDF on this site. I did not read it, but it might offer some details on where/how to get the development models:
https://developer.apple.com/accessories/

Here's a 10.5 inch iPad following the accessory design guidelines https://developer.apple.com/accessories/Accessory-Design-Guidelines.pdf

iPad Pro 10.5"

The problem is that the iPad Pro 10.5 is quite new so i do not think many people have bought one to make a CAD model.

Also Apple used to publish the mechanical drawings of their products for people making cases, etc. but I cannot find the pages in their site anymore.