This connectors would work perfectly and of course you should put at least a ground wire on the frame when the driver is not mounted to the same frame. The driver housing is already grounded and if screwed to the frame the whole fixture is grounded. If you remote wire the fixture and have the driver mounted outside of the tent/grow area you should add a ground wire between fixture and ground connector.
I'll add this connectors to my DIY housing to be able to take all the wires compltely off of the fixture.
Same like yours but with metal housing. Also from e3ay and pretty cheap too.
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