In several instances, iirc, there are what would be reasonably strong 'implicit' invitations to an individual's home (Murphy's is the most common that I can recall: opening the door for an expected visitor, then stepping aside so as to allow them entry while neglecting to explicitly invite them through) that are nevertheless pointed out to not suffice to pass the threshold without effect (and are used in this manner specifically to weaken any supernatural threat the visitor might pose).
In Ghost Story, for instance, when Murphy meets with the WCV in her home. (pretty sure that's not any meaningful spoiler; I'll add tags if I'm asked to, though)
I think any unwholesomeness happening in the home would affect the threshold, or not, entirely independantly from association with a business.