Stay away from the quickcrete, or any "crete" for that matter. Poles set in concrete are prone to accelerated rot usually at a point just below grade. The concrete does not permit moisture to disipate and as a result the wood will become punky in a very short time. Older utility poles of the pines (red or southern yellow) and Doug Fir were treated along their entire length with creosote until environmental restrictions stopped this practice. Western cedar poles were usually only treated at the butt. Newer poles are now treated full length using CCA Peg, the green stuff on PT lumber. This stuff also does nasty things to our planet but it doesn't have the tendency to leach out of the wood in the sun like creosote does. Anyhow I woud just stick your poles in the ground, butt end down, back fill and tamp. I've pulled 50 yr old Western Red cedar poles out of the ground that were set this way and the wood was as hard as this desk top. I don't know much about your climate down there but you want to dig below the frost line. Up here in the Great White North a 4'to 5' hole is required to safely get you into warm dirt during the winter. Hope this helps.
