I liked it, so I did something similar in the downstair half-bath for this minor fiasco:
Both the Walrus and Westley helped me along various steps in the process.
Step by step: First, the boy helped me pick out a color. Milk chocolate, metallic gold, or golden straw? We decided to go w/golden straw.
Carefully figured out the center. What's half of 9 1/4?
After the steam stopped coming out of my ears, I drew it in.
Predrilled the holes (the one in the center is my overall center, not to be drilled).
Attached straight to the wall with the wood plaque (the screws were longer than the plaque, so this was important to go straight on the wall at this point).
Drilled in some very long drywall screws for the plaque. Except I hit a stud, so I had to take it out and use a different screw. I know, right? If only the contractor I hired to hang these in the first place would've hit the studs...It's all good though because the holes, and screw-ups (pun intended) will all be covered up shortly, just like the hole behind the wood plaque was.
Then I attached the towel holder.
Started tiling away...
Ready to use...
And THAT towel holder isn't going anywhere folks!