I personally would only leave the scents out while I am there, no sense in having one come in during the middle of the night and find out your scent leads to nothing and then not return. The rub trees say a bear is in the area, which is a good start, but the majority of rubbing is during the breeding season (late may, june). If it were me I would scout the food sources, looking for feeding areas; acorns, and nuts probably the most prevalent this time of year, once i found feeding areas, circle around and look for bear piles, scat, on trails, if there is fresh poop then they area moving thru that area. I would look for a tree where I could watch as many trails as possible, between the thick areas, where they bed and the food source.

With scents I would put some on or near the trails as well as hang some up high, where you can take advantage of the wind to carry the scent over some distance.

I have a thought but I am sure it has not been studied, but look at the crap pile and see which end is the pinched off end, this end would point in the direction the bear is heading, might " point" you in the right direction to continued scouting.

The fall bears are out to feed and put on weight, so they will be where the food is and resting in the thick nearby.

Hope it helps. It' s the theory I use when scouting for my bear stand.