I have a bunch of questions and am hoping someone can point me in the right direction.
I am looking to install about 2 to 4 outside cameras around the house.

I have a Synology 4 bay NAS DiskStation DS920+ but I use this as a PLEX Server at the moment.

In the name of security, it probably would be a bad idea to combine a Plex server and camera storage in the same location but I might have to depending on costs at the moment. Has anyone done that?
How much storage does this need that anyone has found for a few days of storage? Any hindrance on network?

I know POE cameras are great, and should be probably used but I just don’t necessarily want to run cables all over the place which would require a ton of cabling or drilling through a few walls and a floor. So, I was considering a wireless camera for outdoor use. Anyone use a Wireless camera with Solar panel for power that will connect to the NAS for storage? I haven’t really found much in terms of Googling.

IF this is a bad option to go and I should just bite the bullet and go with POE cameras, Is there potentially an easier way without running tons and tons of cable? or should I just hire an installer?