When placing ground stations for a deep space communications network, there is a well-established benefit to spreading out the stations by longitude. In particular, having at least three stations separated by 120° longitude ensures that a spacecraft is in the line-of-sight of at least one station at all times. This is the case for NASA's DSN (Canberra, Australia; Madrid, Spain; and Goldstone, California) as well as ESA's ESTRACK (New Norcia, Australia; Ceberos, Spain; and Malargüe, Argentina).
Is there also an advantage to having stations at different latitudes? For example, both the NASA and ESA networks have stations in both the northern and southern hemispheres.