We have security cameras the face all sides of our listings, and we clearly state this in the listing details and house rules. We also have house rules against covering, disconnecting or moving the cameras. Hosts can't make guests read, but it's the best to inform them of what they are renting.
In the Things to Note section of our Atlanta listings, we've written, "For the security of our guests and the safety of our home, we have external security cameras located around the perimeter of the house, an apartment alarm and a Ring doorbell at the entrance door." Our St. Lucia guesthouse listings say, "There are security cameras located on the exterior of the guesthouse, in the reception room, and in the common hallway."