Yes focus distance is key to select fixed lens camera, we got a bad review on amazon said 4K-x 6MM Not focus(Thought was bad lens), as we have some further with him, that is the user error, normally there is no blocking on nearby(within the focus distance) will make the pic great. I think install on a vertical wall normally won't be a problem, install on a fence will not focus well, too low.
I think turn the camera a little right will make the pic better.