If you are just going to isolate a smallish object like a chair or plant, you would need a small modifier with a moderate spread, or a larger modifier with a tight spread.
In order to keep shadows soft, you need a large modifier in order to keep shadows soft at 30' you need a really large modifier, then a really tight grid to isolate the object.
This does not exist in the normal realm.
A snoot is the anti-large modifier, and will give the harshest shadows, and our reflectors will also give harsh shadows, with or without grids, at 15-30 feet. Even our beauty dish.
A couple of suggestions. Get a gridded soft box closer. This may require hiding the light, booming it, or taking multiple photos and composite.
Another suggestion would be to use a gridded light, but at just enough power to highlight the intended object, but not enough to overpower "ambient" light. This would then mitigate any harsh shadows caused by the gridded light.
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