Yeah, our car has the black bulbous thing, and it is frustrating. I too have had the fluid spill out, exactly as you describe. The only solution I've found is to be aware of it and try to judge the quantity appropriately, and it takes practice, but it's not something you will do very often.
I didn't know about it "following the fluid down", although it sounds plausible. Mine doesn't do this, it simply displaces any fluid in it's way. It's soft enough to squash with finger pressure, but not with fluid during screw-down, it just spills.
As said above, if you're needing to top it up - ever - it's because you have a leak. That needs fixing.
Get a hose pipe on the area, drench the thing in water, and don't be prudent with it. Brake fluid will destroy the paint on the subframe, which it almost certainly where it ended up, and therefore rust. And the steering rack, and it's pipes and bolts, and bodywork. That ain't cheap to fix.
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