I know that determiners can not be uses together before nouns. Am I right?

For example, He is my best friend.
This sentence is correct.

However, He is the/a my best friend.
This sentence is wrong, for both 'the' and 'my' are determiners. Is my explanation right?

What about the following:some, any, all, first, and two. I think they are quantifiers. Quantifiers are also determiners. However, the following example sentences are correct.

1. All the boys were in the hall.
2. The first two speakers appeared on the stage.

Would you let me know whether all determiners are not allowed to be used together before nouns or not?

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