Alarm wise, I have a "professionally fitted and maintained" system from a local supplier - reduces my home insurance cost. Been in 20 years and company maintain it once a year for £7 / month
I have a few Ring cameras for security, along with the Ring doorbell. Works great for me, i get real time access to them via the £8/month cloud service. All the footage is stored on the cloud, so nothing to nick should the burglars pay a visit. Doorbell works well when we are not in, talk to delivery persons and tell them where to leave stuff (and watch them on the cameras) via app on smartphone or ipad. I'm sure these wont be to everyone's liking, but they work for me. I also have one high up and solar powered - worked flawlessly since I installed it.
They are on offer on amazon prime right now if your interested.