^^^^
THIS
Buy the
https://www.dahuasecurity.com/products/All-Products/Network-Recorders/WizSense-Series/NVR-5-EI-Series/2HDD/NVR5216-EI
Run a cable form its LAN port to the switch your cameras are on, or another switch on your LAN, wait and let the NVR find the cameras or use the search...