Can present perfect tense be used with the adverb "earlier"?

The problem with using a perfective construction in those sentences isn’t the word earlier. It’s that we would not normally say either of those in that fashion.

Rather, formulations like these are more natural:

1. As I mentioned earlier, I don’t like her at all.
2. I went to your place earlier today but didn’t see anything.

It sounds to me like you’ve been being taught guidelines about when you should use perfective constructions that don’t mesh with how native speakers actually speak. If you replace earlier with other temporal expressions, nothing changes:

3. As I mentioned yesterday, I don’t like her at all.
4. I went to your place yesterday but didn’t see anything.

If you really want a perfect form in the beginning, these work but mean something completely different:

5. As I have mentioned repeatedly, I don’t like her at all.
6. I’ve been to your place before, but I’ve never seen anything.

The last one doesn’t have to be overly perfective:

7. I’ve been at your place before, but I never saw anything.
8. I’ve been to your place before but never saw anything.
9. I’ve gone to your place before, but I never saw anything.
10. I’ve gone to your place before but never saw anything.