Some people have to call or email customer service to get their camera systems connected. It depends on what company you're buying them from, because it can get a little complicated. I bought my eight outdoor cameras system with a NVR, and connected it through WIFI. But it's best to have you cameras connected to the NVR by Ethernet for a stronger connection, since each camera antenna will be outside the house. I don't have my camera system connected to any cloud storage right now. I'm sure having your cameras connected to a cloud through WIFI, is better than having them connected to a NVR through WIFI. I bought my camera system with the NVR so I wouldn't have to pay a monthly monitoring fee.
As you know, although they call these "wireless cameras", each camera still have to be plugged into some kind of socket to get electricity. With that said, although you can have your cameras hooked up through an outdoor socket, you'll eventually want to run those wires behind the camera and through the outdoor wall, up to the roof, and into the attic. Then you can plug each wire into a multi outlet socket in your attic, instead of leaving each camera plugged into an outdoor outlet, with the wires exposed, where a thief could easily cut the wires or unplug them from the socket.
But whoever you buy from, it's best to research and make sure their camera system, especially their outdoor cameras, have a good mobile app. Not all of them have a reliable mobile app for remote locations, like my camera company don't, and sometimes I can't get all my cameras connected. However their software they sent me to download on Windows seems to work okay on my computer for the most part. But I'd like to have that consistency for my mobile phone too.