To disable all cameras that only save data to the "cloud", like dropcam and many others, you can also just temporarily disconnect the cable or phone wire on the outside of the house.
Wouldn't that stop you using their Wifi, presumably included as part of the listing? That's probably another surveillance risk to be fair, but I think most people expect it and tolerate that risk.
If you read the article at the end the author says it's legality is questionable due to FCC changes that include kicking somebody off the wireless as jamming them
