CCTV recommendations for purchasing online?

Hello r/india, I need to install around 8 CCTV cameras (6 bullet + 2 dome or 8 bullet). Night vision, audio and 2 to 4mp range. I don't need online viewing, just proper recording will do. CCTV guy is quoting 40,000+ rupees which seems really costly. I am thinking of buying them online and paying a local installation guy to install them. Buying them offline is not an option for me. Has anyone done something similar? I searched on Amazon and none of the cctv sets (with DVR etc) have "good enough" reviews e.g. https://www.amazon.in/HIKVISION-Channel-Cameras-Recording-USEWELL/dp/B09Q8HP65Y/ - all recent reviews are "1 star" about cameras or HDD failing. So I thought of asking people for links who had actually bought and had good experience. Should I consider buying a set like above and then buy parts that are faulty or missing? Buy each part/camera separately and install them myself? If nothing works out, I will go with the costly local CCTV guy's service.. Thanks in advance for all the responses!