One grounding point- - - - -no!

Sheet metal screw to attach the ground(s)- - - - -"L" no!

I'd use several ground wires and attach them with a machine screw and nut at both ends.
Jerry
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"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!