Two or four wheel alignment

Your particular vehicle does have an adjustable toe setting in the rear. Based on that, I would suggest having a four wheel alignment performed if necessary. One thing I always check though before recommending an alignment is how the old tires were wearing. Were they wearing unevenly or were they worn pretty flat/straight across the tread? If they weren't uneven, you can probably forgo the alignment altogether.

Attached is a chart showing typical examples of uneven tread wear. Any of the examples in the columns labeled Wear on One Side, Feathered Edge or Scalloped Wear would indicate a need for an alignment.