House Sparrows

Will 2 Schwegler Woodcrete Avianex 32mm nest boxes close together potentially be enough to attract House Sparrows to nest in my garden? There is limited space for other nest box styles such as a sparrow terrace and having done some research I prefer that these are supposed to insulate from the sun/cold better, be waterproof, last longer, discourage the dominance hierarchy sometimes reportedly seen with terraces and be more robust against squirrels. Should I add a third box to make a ‘sparrow street’ or should 2 suffice? What are other people’s experiences/thoughts?