I have a pyronix smart type alarm which has been faultless. I declined getting CCTV but Pyronix own Hikvision which you will find everyone recommends for CCTV.
The app is simple and can combine both alarm and CCTV now they are one company.
Budget £1.5 to £2k to have both installed and you will have a system that is far superior to the ring / nest type systems and without the monthly fee for cloud storage as you'll get your own dvr box.