Help me to know the correct positions of the adverb 'probably' in sentences.
Please let me know which of them are correct in the following sentences:

1. I will probably not be there.
2. I probably will not be there.
3. I won't probably be there.
4. I probably won't be there.

5. He probably does not know.
6. He does probably not know.
7. He does not probably know.
8. He doesn't probably know.

Question

Help me to know the correct positions of the adverb 'probably' in sentences.
Please let me know which of them are correct in the following sentences:

1. I will probably not be there.
2. I probably will not be there.
3. I won't probably be there.
4. I probably won't be there.

5. He probably does not know.
6. He does probably not know.
7. He does not probably know.
8. He doesn't probably know.

Answer

I am a native speaker of American English from Southern California so my judgements are based on what I hear regularly.

1. I will probably not be there. - good
2. I probably will not be there. - good, but a bit awkward In spoken language
3. I won't probably be there. - not heard 
4. I probably won't be there. - most common in spoken language

5. He probably does not know. - good, but in spoken speech it would more likely be heard "he probably doesn't know"
6. He does probably not know. - not heard
7. He does not probably know. - not heard 
8. He doesn't probably know. - not heard

Answer

I don't know what is 'correct' - just what sounds right.
To me, 2,4 and 5 are good.
1 is OK - in spoken language.
The rest are not natural.