Is with all intents and purposes correct?

"All" needs to modify a plural noun, so "intents and purposes" would be correct.

"For all intents and purposes" is the correct phrase according to American usage. The British version of the idiom is "To all intents and purposes." (See the Related link.)

The correct saying is "all intents and purposes".

You could use either all of which are... or which are all...

Neither of the phrases in the question is correct. The correct wording, in American English, is "for all intents and purposes." In British English, however, the wording of the selfsame idiom is "to...