Homeowner here, wiring a new addition...

I feel like there's probably an easy answer to this question, but I haven't had much luck finding it here or on google: if I have multiple cables running up a 2x4, what is the best (inspector-approved) way to attach them and still keep them 1 1/4" from the edge of the stud?

For individual cables, I've been using the white plastic "staples" (like these: http://www.amazon.com/dp/B000BQNCIU). But these are only supposed to be used for one cable, right?

And, for bundling multiple cables where the 1 1/4" inch rule isn't in effect (like in the attic), I've just been using zip ties (and attaching them to joists/studs).

One recommendation I saw was to staple the first wire and then stack and zip-tie the others to the first one. Is that acceptable?

I've also seen (and used) the cable "stackers" that accept up to 4 cables, but that seems like overkill (and expensive) for just 2 cables.

What methods do the pros use?

I'm in Seattle, so whatever I do will need to pass inspection here.