Grounding TA2022

According the datasheet of the Tripath TA2022 pin3 VN10GND should be connected to PGND also earth because of the screen/shielding of the chip.

The board has a grounding system where the following parts are ground together:
- 0 of the symmetrical ac input
- the "-" of the unbalanced input
- the "-" of the speaker terminals output

What's best practice to ground these to mains earth?
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