In your experience, roughly how many biodynamic accumulator plants per other plants are needed to be effective as slash mulch?

I know it’s not exact and so many factors would affect that answer. But this is my first time trying to use borage and comfrey in this way, I’m planning a vegetable garden with a mix of annuals and perennials. We do have some heavy feeders like tomatoes, cucumber, zucchini, onions, etc. The soil will be amended beforehand to have a decent amount of compost, it wouldn’t be the only source of nutrients but I still want to use these as a tool for extra nutrients as well as to help suppress weeds, be insectary and pollinator plants, etc.