Heads up, PEI sheets are great because you can take them off and flex them a bit to pop parts off, but it is worth noting that PETG (and TPU) can also bond too well to PEI. It depends a bit on the kind and quality of the PEI, but you may still want to use a release layer (I’m partial to washable glue sticks, but everyone has their own personal preferences) just to keep your plate safe.