No dash lights

That was the spot where it was, it’s built into the board so no need to add one per charger specialties...I guess I could ground it from there. But I should also ground the circuit screws too?
I'm going to call BS on a noise suppression cap' being built into a circuit board. Maybe you have a solid state limiter there that doesn't make electric noise. Anyway...
Just 1 well secured ground placed anywhere works. Once everything is grounded to the housing ( those screws ) the goal is ground the housing. The factories screws trough the housing into the dash are supposed to ground it but those are often pizzy little 'U' nuts on painted metal. Plus the panel isn't grounded at all until fully installed. All that the cause for adding a ground wire somewhere on the housing.