Homelab

I bought a 2 pack of these for $90 on sale.

https://amcrest.com/prohd-5mp-outdoor-security-ip-turret-poe-camera-2-8mm-lens-103-fov-ip67-weatherproof-white-ip5m-t1179ew-28mm.html

PoE is 100% the way to go. You can have a UPS on the circuit where your switch is, and cameras won't cut out any time you need to pop a breaker and do any electrical work.

I had some spare PoE injectors from other equipment, and I'm sure you can find some secondhand ones for cheap. Seriously, running a single low voltage wire cannot be understated.

If you need to run conduit outside I would just use some small grey PVC. Or you can find outdoor rated Cat5/6 cable with black sheathing that will resist UV, and is filled with dielectric grease.

As far as a switch in the wall, they should sell some steel or PVC boxes that will sit in between studs and mount flush. Kind of looks a circuit breaker panel. Mostly used in commercial buildings, so you might want to check an electrical supply house locally.

Stop and do a ton of research, define your use case and what you actually want before you move forward. Otherwise you may spend a lot of time and money and end up with a camera system that doesn't come close to what you want it to do.

https://ipcamtalk.com/ is a decent set of forums to start learning some, learn about various camera models, etc.

Really define your use case, what are the camera's for, what do you need them to do during the day and night. Many people think that wide field of view at 2.8mm is great because they can see a lot but then discover there aren't enough pixels to tell who someone is from even 15 ft away, and then they discover the ccd is absolute dog shit at night. It's relatively easy to get a decent picture with a tiny undersized ccd during the day with a lot of light, but at night things are different. Make sure you understand DORI (detection, observation, recognition, and identity), measure the distances you're going to be working with so you can cover the important DORI aspects, ensure the field of view, and resolution support what you want. Understand what difficult scenes look like, sun dumping directly into the camera at sunset will fuck up all shitty software based wdr.

Use POE it'll save you headaches. You can buy industrial poe switches that you can place in the attic depending on code / attic temperatures. In fact just buy better camera's it'll save you headaches.

What are you going to use for an NVR? or are you goin to try to use on camera recording?

If you want everything recessed look at buying a small structured media center that'll fit cabling, switches, power, etc.