mins takes three XYZ values to position the 'near bottom left' corner (facing towards positive X of entity alignment) as an offset from the entity origin. Must be used with, and values must be lower than, those in maxs.
Example: mins 4 -6 -4 (sets bottom corner coord to +4 -6 -4 offset from the origin.
The spawnarg noclipmodel must remain at the default 0 (zero) or this mins spawnarg is ineffective.
Making a dedicated collision model should always be prefered over using this method.