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The main page of this site has minimum size recommendatins. Five pigs need 2x7 grids, or some arrangement of that.
All on one level? Yes, that would be fine. Although, if they have difficulties, sometimes a wider but shorter cage will forestall any problems. They're harder to clean, though.
It looks fine to me. As bpatters says widening it to a 3x5 might help spread things out a bit more, even though it would be the same size. I counted your grids and you would have enough for a 3x5, if that arrangement fits in your space. Either is fine, it’s up to you and your piggies.