There are scads of ways to get a usb cable out of a home with little or no effect on the structure. I stream 4 Logitech c920s, and except for the 'snowcam', which moves around seasonally, the cables are practically invisible from the exterior, etc. Cost for a c920, extension cables, real housing, maybe $130 Add a -2 diopter and you're still under 150, depending on what active extensions you need.
You'll still have to get a power cord to a wireless cam in all likelihood also. You'll have the addition of the receiver to your shelf, and it's wall wart to your power box. And you'll probably still connect the receiver with USB or at least a video cable. Your overall image quality on a lower priced wireless will probably be degraded compared to the little Logitechs from what I've seen...
I tried a couple of lower priced wireless cams prior to settling with the wired Loggies...

Mike