Hi
@nakashima
There's a number of options.
At this point TEST the positions you are considering, remember to pay attention to future light fixutres...
see this
Light fixture causing washout (photo)
Depending on the construction, I would consider:
For a new construction, especially due to newer insulation methods, I like to have plenty of extra cable in a nice 2-gang or deep 1-gang box. I like metal boxes much more than plastic, and I like to have a good amount of wood on either side of the box so that I can at least drive longer screws on one side of the camera base or the junction box / wall mount into the studs / plywood. If you know the type of cameras you will have mounted, you can even use the appropriate junction boxes at this time.
If the insulation is a batt / fiberglass then I can skip the gang box as the loose insulation gives me a chance to stuff as much cable as I want back into the wall cavity.
Remember to over cable ( N+1 per drop ) w/quality
cat5e/6 cable ( solid copper wire, 23-24 AWG ) - run the cables longer than you would expect - leave at least a few feet extra, you can trim it later if you have the need.