I had a
Response system on a rental property a few years ago. That had a couple of contacts for the front & back doors & a couple of PIRs. Bell box was solar charged & control panel ran from an ac adapter. Dead easy to install & worked well enough but the control panel was a bit heath-robinson. May have improved by now.
A friend of a friend is an installer. His take is that ONLY wired systems are up to the job. He says that within the industry,
Infinite are the only wireless brand worth considering.
You need PIRs as a contact will not alert to access gained by a broken window.