Mayamatam 19.39

19.39

tale tale vimānānāṃ dikṣudevān nyaset kramāt
pūrvāyāṃ dvārapālau tunandikālau ca vinyaset

On each storey of the temples, one should install the deities in the cardinal directions in order: / in the east, one should place the two door-guardians, Nandin and Kāla;