I have a question about the crossover rule, which has been confusing me. My main fandom is Tolkien, where The Silmarillion, The Hobbit, and The Lord of the Rings are separate books, but set in the same universe and forming one continuous history (including a few of the same characters). I've written several stories that draw on more than one of those, such as the Silm and LOTR, and so I've tagged them with both fandoms. Are those works ineligible as crossovers?

(If they aren't eligible, then I don't currently qualify for Lord of the Rings, but I can write another drabble or so if I need to.)