Garudapurana 1.126.3

1.126.3

dvāraśriyaṃ ca daṇḍaṃ ca pracaṇḍaṃ vāstupūruṣam /
madhye cādhāraśaktiṃ ca kūrmaṃ cānantamarcayet //

And Dvāraśrī, Daṇḍa, Pracaṇḍa, and the deity of the site; / and in the centre one should worship the supporting power, the Tortoise, and Ananta;