The most useful product offered by Nest that the Ring system does not have is a connected lock. This tamper‑proof, key‑free deadbolt connects to the Nest app, letting you lock and unlock your door remotely. Users can also create passcodes for family, guests and people they trust, or give them a Nest Tag programmed to let them in only at certain times of the day.
Regardless of whether you go the adhesive or hardware route, Ring provides everything you need right in the box, with installation kits for each component of the system conveniently boxed and labeled to make it easy to find what you need. All you'll need if you want to use the included screws and anchors for hardware mounting are a screwdriver and a drill.
Just one final question if I can, I was looking around a little more at some of your articles and YouTube videos (they are awesome! short and sweet and to the point!), and it seems like the Blink XT would also meet my criteria (the 9 pointers above), is that right? The thing I liked was that it’s much cheaper and apparently I’m getting the same, no? Is there anything I’d be missing out from my list if I go with the Blink camera (and overall do you recommend it)?

Third, Nest Guard has a voice. Of course, it’s no Google Home, but it will provide useful information. For example, when you arm your system, there is an arm delay which allows you to exit your home without setting off the alarm. Instead of an annoying beep that continues until the system arms, Nest Guard uses a friendly voice to tell you how much time you have left.

The motion and door/window sensors can be mounted with screws or with Velcro strips (provided). I’m happy the sensors didn’t come from the factory with the strips already attached. I’ve never seen an adhesive strip that didn’t eventually fail, so I prefer to use screws—and peeling those strips off so you can use screws is a major pain. The sensor batteries come preinstalled, so you just pull out a plastic tab when the app tells you to. This enables the battery to touch the electrical contact inside the sensor, powering it up.
Wow! I’m impressed that you read the whole thing. A mobile hotspot, right? I think they would all tell you that it’s possible, but not something they recommend. The signal isn’t going to be as reliable as connecting to a WiFi network. Arlo sells a 4G camera called Arlo Go, but it’s more expensive upfront and the monthly fee is higher as you’re paying for cellular connectivity.

After the battery is charged, you can move the camera to a new location, so long as it’s within your WiFi’s range. The camera will work using battery power alone, or you can continue to use it plugged into a power outlet. Since the launch of Canary Flex, Canary has also promised a 4G LTE mount, but they haven’t, and probably won’t deliver. If cellular connectivity is something you’re interested in, I suggest you look into Reolink Go or Arlo Go.

It was 20*F outside when I installed the cam. I didn't want to be running up and down a ladder if I had problems connecting to the network. I wired the cam up with a plug (from an old, grounded extension cord) and ran the wifi setup routine at my kitchen table. I verified everything was working (including the app, motion detection, etc.) before I installed it outside.