Hello, I am running up to three sites at the same time and it's time to invest in security but I really don't know what the best system would be. My requirements are the following: - up to three small construction sites at the same time / the locations keep changing every three months on average, WiFi available on site, - need two outdoor battery powered cameras per site, plus doorbell, plus sometimes perimeter monitoring, - ideally one week in the cloud recorded data, maximum one month if weekly not available but local NVR acceptable too if solution too expensive, - I need to see everything as admin. Each site can only be accessed by the relevant site manager. Can anyone guide me? Many thanks in advance.