Hold him to your early termination offer. 

I posted a 60 day notice to terminate the lease (the lease says 60...), the same day I receive a message from her boyfriend (I think) who I met once briefly but does not live at the property, saying that she is not living there, and that she cant be reached.

If you had done the inspection on time, it would have given the agent time to negotiate a better deal for you or had the option to terminate the contract.

The wifi is what will allow you to access the door remotely.If you don't want wifi on it, Then you can still get a smart lock you'll just need to pre-program several different codes into it, and then give out those codes appropriately but you'd need to be on site at the door itself to program initially or update it.From personal experience I find the touch screen or wifi locks to be complete POS's that are not reliable and the battery does not last long.  

Per the original issue, circling back to confirm that I connected with a lawyer I've used before and they suggested to just issue a standard termination of month to month tenancy which requires 30 days.

If there will be any delay I  would also send official notice of pay or quit or termination of lease in case they cannot proceed, explain to the family if you get payment and continue to get payment you will rescind notice. 

These states allow landlords to terminate leases and evict tenants quickly, with no rent control laws and a strong legal framework.

Check the Lease Terms: Ensure the lease clearly outlines responsibilities and terms.Background Check: Verify the renter's legitimacy and experience with short-term rentals.Insurance: Ensure your insurance covers short-term rentals.Local Regulations: Verify local regulations for short-term rentals to avoid legal issues.Exit Strategy: Understand what happens if they terminate the lease early.

I suspect virtually everyone realizes property values can go down and do go down in the short term (in every market that I am aware of). 

Let me get together a lease termination so that you all can find a place that would suit you better."