She wanted her investments to grow but didn't want her money locked up for decades.

If the remediation devices intrude significantly into the livable space, that will probably detract from value. 

After several inspections and a few deals that didn’t pan out, I was able to lock down a duplex in a high-demand Airbnb area.

Meanwhile, you could be locked-in to a purchase price that is 5-10% below comparable sales by the time this finally closes (Q2-Q3 2025).All the best!

Locks are there to keep honest people out. 

, any personal items to be removed/locked up etc? 

So if you are self managing your property and it’s under an LLC and you lock the doors and do not give them access - guess what - the tenant does not sue the LLC fairy - they sue the LLC and the person who committed the act.

As an alternative you could look for a walk-out, lock-off basement and add a small kitchen/kitchenette down there to have your own space away from your housemates.

Hello, We don't currently have a STR, but posting here because many STR use these kinds of devices.   

That way you would be ready and when rates hit your target mark, you can lock it in and close right away.