I like perfectear plus from sign warehouse. Blue painters tape would probably work though. Even plain masking tape if you’re careful.
Basically you want it sticky enough to reliably lift up the pieces but not so sticky that it’s hard to remove.
Giant discussions abound, here’s one:
https://community.glowforge.com/t/masking-material-for-non-proofgrade-items/22442
And another:
https://community.glowforge.com/t/purchased-masking-isnt-tacky-enough/18012