Do these interferometer type of arrays attempt to have the dishes at the same level essentially a flat plane? Or can they adjust for that with the timing used t

Do these interferometer type of arrays attempt to have the dishes at the same level essentially a flat plane? Or can they adjust for that with the timing used to "sync" them together so one dish might be in a dip while another is higher on a mound. TFA mentions 150km diameter array. Does the earth's curvature come into play as well?