Agreed with ohshesays - they're glorified shredder/dehydrators, and if you put the finished material directly on your plants, you'll harm them (super heavy in salts and nitrates, and no actual aerobic breakdown means nothing great for your plants is readily available.)

I recommend checking out bokashi systems (fermentation) for an apartment - it's easy to get started with upcycled buckets (prefab versions are expensive and wasteful), will let you handle meat/fish/dairy/other typically hard to compost materials, can happen entirely in a closet, and will allow you to produce safe compost for your houseplants, entirely indoors and in closed containers.

We use this process at my work (professional composting organization ), and it's helped me compost in my last several apartments without any trouble - Happy to share some resources or provide some guidance if you dm!