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In other words, this is Might & Magic: Heroes VIII. The gameplay is canonical. However, the city screens remain in 2.5D, just like in Heroes VII. A tight budget, wouldn't you say?
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A large creature occupying four hexes (in a cross shape) will take up three lines, which means the battlefield will have to be even larger, but then all of this won't fit on a mobile screen.
Large creatures can simply be three-hex wide, which is easier. Or even two-hex wide, like in Heroes of Might and Magic III, but that also looks strange when the creature isn't large in itself, but simply elongated.
A three-hex width creates dissonance, while two is meaningless. A creature with a two-hex width (elongated) can slip between two small creatures in a single hex.
A 3-hex horizontal arrangement feels dissonant.
No, of course not. A triangle.
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Or like this:
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Or with the possibility to stand and face either way, although that's a bit mind-bending (but tactically it could be cool for forming dense ranks).
If the arrows are in the corner, it will work (with the correct corner geometry, because there are two options).