one of our top sellers

Question

Apple and airplane prints are two different designs of prints.

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1. The apple and airplane prints are still one of our top sellers

After a search, I understand it is correct to use plural. For e.g. one of the bags, one of the baskets, one of the leading companies.

Will that rule still be applicable if is to use with more than one item like in sentence 1?

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2. The apple and airplane print are still one of our top sellers

In sentence 2, If I were to use print instead of prints, does it convey the same category and quantity as in sentence 1?

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3. The apple prints is/are still one of our top sellers

In sentence 3, is using is acceptable here if I would like to convey a category instead of the number of prints?

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4. Apple and airplane prints are still one of our top sellers.

In sentence 4, does it convey that apple and airplane print belongs to the same type of printing category but two different designs?

Answer 1

Perhaps you are imagining that "one of our top sellers" is an idiom. Or, that "one of ___" is. In other words, it's a fixed phrase which has a special meaning and shouldn't be modified.

If so, that's not exactly true. The sentence ought to make sense when intepreted literally.

Thus, you shouldn't say "one", when at the beginning of the question you have already clarified "Apple and airplane prints are two different designs of prints."

Alternatives are:

The apple and airplane prints are two of our top sellers.

or

The apple and airplane prints are among our top sellers.