My current setup:

• I have multiple Nest cams inside and outside my home and garage. I actually like the Nest cams configurability and they’ve served us well so far. That said, I’m not married to them.
• I setup Armor Concepts door armor on my back door and garage door.
  • I don’t have it on my front door, but my front door has a storm door that locks.
• My house is about 1600 sqft with a disconnected garage.
  • Two doors, front and back.
  • 2 normal windows that are accessible without a ladder.
  • 4 smaller basement windows that one could in theory(but not easily) break and crawl through.
  • I wouldn’t lose sleep over keeping my garage just monitored with Nest cams as I don’t keep much in there outside my cars and the door is pretty sturdy.
• I have a bigger budget and I am willing to pay for the best solutions.

Questions:

1. Do I need window/door sensors if I already have Nest cameras covering most of those? If so, which brands/models are best? I know Nest used to have some but they are discontinued.
2. Although I like Nest, I can’t always be available to check my phone and cameras. Is it worth having a 3rd party company do monitoring? If so, which ones are best? And how much do those usually run?
3. I have some smaller basement windows. Are there any decent solutions there? I’ve heard of maybe film coverings? Additional sensors?

Thanks in advance!