BuyFromEU

I'm the wrong person to answer the question. I have a Home Assistant at home. But I don't really need alarm and video surveillance where I live and with my specific environment(?). So I'm more or less just tinkering around. I have some Ikea Zigbee motion sensors and window sensors to control light and thermostats. And I occasionally solder together some abominations of sensors... And thanks to Home Assistant, all of that can double as some sort of poor-man's alarm... Send a push notification when there's movement in the hallway without anyone present...
But it's not really a proper solution. The Ikea sensors are very nice, but not really designed to do security. And my setup requires Wifi to be available, the Zigbee or Matter bridge, electricity for the server... And the intruder of course can't steal the server from the broom closet, or I'm screwed... So I think it works for what I'm doing here, but it's not a professional solution by any means.

Edit: As hopfi pointed out, there's of course more electronics manufacturers like Shelly as well...