It will work just fine on the macerator.
It'll even work on the inverter.
But
Galvanic stuff gets involved.
Whole boats are basically eaten from the waterline down if there is a leak on the positive side anywhere. That s what sacrificial anodes are about. The voltage leak likes zinc better than anything else commonly used as building material.
What I did/do:
Speaker wire is available up to about 4guage.
It's bound like, well, speaker wire.
I run positive to a fuse and the negative to a bus bar sitting next to the fuse block or to the negative on the fuse block.
You have to make the positive run, just bus bar the negative right next to it. The wires are bound so you just make one pull... It might even be easier than self tapping the negative into the frame with some wonky run.
Punchline:
Sure you can run to the frame.
But
Galvanics
Loose damn 'forgot where I put it' self-tappers God knows where.
Corrosion like the 'headlight/tail lamp posters are running in to.
Speak to not doing it.
Run10guage speaker wire that is bound and color coded.
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