This may need a signature. Just be aware.
Google said UPS could leave the package without a signature. UPS said no to that on the website. If you create a MyUPS account you can tell it that you authorize packages to be left and click on a liability disclaimer. Otherwise the package would have been returned without a signature.
A lot of times it depends on the location. Like I live in an apartment building and even if I sign the UPS slip they leave one day and authorize them to leave it the next day - they won't. FedEx, however, will leave just about anything.
This does, however, lead to me being well-known at our local UPS facility. It's only about 2 miles from my place.