I cut four pieces of 3 foot long, 1.5x3/4 inch wood, and four 2 inch sections of 1 1.5 inch diameter dowel. Screwed it all together, used a stud finder to locate the ceiling joists, and screwed it in. It's holding 9 rods right now with room for a few more, and is holding up quite well.
The whole thing was free from junk wood I had in the shed, and it took about an hour to build. Quick and strong solution.