We have purchased 50 Latitude 3570 laptops, all preloaded with Windows 7 on them.   I need  to upgrade them all to Windows 10, configure them identically 49 times.

From what I've read on the forums, it seems that the license key is no longer a label on the computer, but rather embedded in the firmware, so running something like clonezilla is plausible.  I would just need to make sure the license is reactivated and Windows 10 will pick it up from the firmware?

I just don't want to clone everything and in 30 days 49 of them need reactivation.  

Thanks in advance, and if there is a sticky or forum discussion I can read that I missed, I appreciate that as well.