To test my understanding, you're wanting to apply Transform > Upright > Auto to multiple photos and have the upright transform computed separately and automatically for each photo, without having to click Update on each photo separately. If my understanding is correct, then here's how to do that:
1. Select all the photos.
2. Edit one of the photos in Develop.
3. In the Transform panel, click Auto.
4. Click Sync... at the bottom of the right column and select Upright Mode and no other setting:
5. Click Synchronize.
You can also create a preset that does this in the same way.