If you need privacy glass for your macbook but you don't want to pay tremendous money for magnetic version, you can easily buy any privacy screen protector and attach it to those holders.
What you need:
1.5 hours of your print time
Any privacy screen for your screen size
Holders are designed for newer macbook thickness (2016+)
Happy printing :)
Please note: if you do not have good adhesive on your bed, use BRIM raft so it will stick to your printer. I use glue on my Prusa so I have it without BRIM.