Rent per room laws in Austin, TX

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Being a resident/investor of Philadelphia, PA where rent per room has strict rules from the city, I am curious to know how that plays out i Austin, TX. Can someone direct me to specific resources or share the rules on renting per room in Texas? In philly, there is a 'no more than 3 strangers' rule but how about in Austin. Looks like there is a rule on no more than 7 strangers for a single family unit but does that mean you CAN has 7 strangers with indivual lease under a SFH? What other rules I should be aware of as an investor? Both for SFH and multi unit. Thank you.