I use an assortment of devices accumulated over years. First line of defense is a good alarm system. I have a DSC system installed and maintained by a commercial vendor. It's cellular linked with it's own modem so no wire cutting or phone outage affects it. Having it professionally maintained means if it needs something while we're away, my home watcher can just call them out to fix it.
I have webcams that relay video to a server hidden in the house. And they send me periodic snapshots via email, which confirms they're OK and the home internet is online. I like the ones with PTZ, so I can move the camera to check on specific areas that I'm interested in.
Speaking of internet, I've found it's a good practice to use a simple timer to kill power and reset the modem / router daily.
And I've added a Lorex 4k recording camera system most recently. High resolution wide field of view cameras on all sides of the exterior.
My goals are to prevent crime, by being a hard target, and avoid surprises.