I use a wall mount for my meta and to be honest, its a pain. It takes up more room than leaning the bike against the wall, and depending on the saddle height, it can really get in the way.
I use one of these type things (loads on the market)
http://www.chainreactioncycles.com/Models.aspx?ModelID=10230If you (or the wife) definately wants one then try to get one with lots of rubber or foam over on the hook (rubber is better

)