For consistency and ease of use I highly recommend using an NVR; it's the easiest and most consistent way to get your iPhone and MacBook to talk to your cameras. Once again, I'd like to stress my original point about cabling regarding wireless cameras and ask you to consider how these are supposed to connect. You say you want one at your front and and one at your back gate. Does your personal home WiFi give you a good signal where you intend to hang those specific cameras? Do you have local power outlets there? If the answer to either of those questions is no, then WiFi is not going to be an appropriate solution for you.
If you have direct line of sight from your home to the gates and local power, you can create a stable wireless connection with 2 of these: https://www.securitycameraking.com/product/2nd-generation-5ghz-nanobeam-ac-bridge/. If you've never worked on these, they can be pre-programmed for you for a service fee. Then you are free to choose any IP camera available on our website.
I hope this can provide you some direction.