Mixing both PoE and WiFi Cameras

[user_786062497357997_786062497357997]

I am currently a user of Reolink with NVR with PoE cameras in an apartment complex that I manager. We like the system and would like to add another system to another complex, however this complex is much larger (4 buildings and a large row of garages), and currently doesn't have internet (although we are looking to add internet in 1 building). Even with the internet the complex is large and will need a mix of indoor and outdoor cameras, mostly for vandalism deterrent purposes. So the best thing I can think of is to do a mixture of wired cameras and wifi cameras. My concerns are:

1. Wifi connection is not great in our rural small town
2. the complex is large and wifi cameras may not always have great connection, I assume there is a "back up" recording on a memory card.
3. Which NVR system should I choose? Ideally I would want 10-11 cameras most of which would be wifi due to distance. I was looking at the RLN36 but others in the community say RLN8-410
4. The complex is 116 meters long, is that to much for WiFi Cameras, my NVR & WiFi would be located in the middle of the property thou.
5. And I need at least 2 of the large dual lens cameras I am looking at the Reolink Duo 2 WiFi

Help! thanks!