Mayamatam 35.27

35.27

atrocitalakṣaṇaṃ tat śūnya talaṃ tuvā cākṣam
grāhyaṃ kṣetragataṃ yanna tadyogyaṃ sarvathā tyājyam

Here, whatever has suitable characteristics, an empty ground or axis / that is found in the precinct is acceptable; what is unsuitable is to be discarded entirely.