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Can I give +3 to hit to a unit with 3 different rhino primaris?
The rule says : «Add 1 to hit rolls made for a single friendly <CHAPTER> unit within 12" of this model until the end of the phase.»
In the FAQ Rulebook, it says a unit cannot benefit twice from an «identical aura ability». The rhino primaris rule is not an aura.

What makes it not an aura?

It's an aura ability. Read the description in the core rules. No, you can't.

Nope.

+3 to hit can be achieved with 1 rhino primaris, the new target priority WL trait and crimson fists chapter tactics though.