And the 9.5mm 1-TB one that I looked at also had a high failure rate too. (That's what you get for trying to cram all of that storage in such a small place...)
Most Seagate 1-TB drives are 15mm high.
On my white, 12" MacBook, I am certain that 9.5mm is the maximum height.
But this post is about the newer Mac Laptops...
Debbie