Those pictures were of ours. It's the one with green towels on page 2 of the "Sho-N-Tell" pics in the Photo Album on the MOC homepage.
http://s89.photobucket.com/albums/k2...towelrack2.jpg
I tried the provided screws, but they weren't enough. Then I tried hollow wall fasteners but that wasn't too good either. What I wound up doing (someone may have a better idea, but ours have been up 4 years now) was to use a good double back tape under each base and then screw in the provided screws. I used tape larger than the "footprint" and then trimmed the excess with a razor knife. One thing I'd do differently - I'd glue and/or nail the round bars in place so they won't turn. If we leave towels on during transit, they will roll off everytime.