We also use the Progressive Industries - NOT hardwired in. It's been awhile so you'll want to do your own comparisons but, at the time, it was the only one that advertised the ability to swap out parts. I read somewhere on the forum that someone had a part damaged, bought the replacement and made the swap with ease. It beats paying for a whole new device.
We have a steel cable with loops at each end and a small letter combination lock. We can sometimes close the electrical post cover and secure the device with just the lock but other times we try wrapping and locking with the cable. Don't tell anyone, but we've been known to "secure" it with the cable so it looks like you can't lift it off when in actuality, you can. Some posts don't have anything to secure it to so we try to make it look good.
If someone is intent on stealing things, they'll get them. Our security is for the impulse thief that sees an unsecured item they'd like to own, no one around, and away it goes. If they come with bolt cutters in hand, it's going with them.
