Take a look at Blue Iris (unfortunately Windows only). It supports almost every camera imaginable, and has the benefit that it runs on a single Windows server

Take a look at Blue Iris (unfortunately Windows only). It supports almost every camera imaginable, and has the benefit that it runs on a single Windows server you can secure, while it pulls camera feeds directly from the cameras over your private network. You can still download a mobile app and connect securely to the video server to browse recordings or watch live feeds. I much prefer this model, because then I don't have to trust all these terrible cameras; simply isolate them on a private wifi network that only your Blue Iris server can reach.