New TAZ 6 Modular Bed without PEI Print Surface

Is it possible to just print on the metal surface on the modular print bed without having the PEI print surface?

No, you can’t print directly on the metal bed heater.

The glass bed comes with PEI on one side and glass on the other.
If you don’t want to print on the PEI side, you just turn it over so the glass is up.