I recommend using this: https://github.com/TheLastGimbus/GooglePhotosTakeoutHelper

A couple years ago, Google decided that instead of exporting the photos with EXIF data exactly as you've uploaded them, which was the original behavior and how platforms such as OneDrive do it, they are going to completely delete all EXIF from the image and instead also create a .json containing the original data, in a non-standard format. This script is an open and free version of a paid tool that goes through each image, finds the corresponding .json, and puts the EXIF data back on.

If you don't do that, when you reupload these photos into a new service, the date will be reverted to the day you've downloaded them and location data will be missing entirely.

Immich-go is stupid easy.

Just dump all your takeout zips in the same folder as immich-go and run the import. Lmk if you need help.

It ingested 60+ zips with 100gb of photos when I used it.

Used immich-go for this too. Had no problems, and the dev is really open to feedback. All the metadata was there (except for labeled persons), and albums were also created correctly. It even inported archived photos into Immich's archive!

If you import it as external library, Immich will not be able to modify or delete any of the files, but you will see the files just like you see ones uploaded using immich. It is up to you to decide what is better