SEO mobile: separate urls configuration for multi device mobile sites

Hi All ,

Hi hope someone could answer to this question because on internet I haven't found a clear solution so far:

I have:
◦1 desktop website (let's make Example Domain)
◦and different mobile websites for each main device (let's make iphone.example.mobi; android.example.mobi; winphone.example.mobi)

In order to optimize my mobile websites, According to the Google guideline of the above separate urls configuration , I should add a tag link alternate media in the desktop page and a canonical tag in the corresponding mobile page in order to create a connection between them. But, I need to keep a 1-to-1 connection between desktop page and mobile page (Google recommends to have 1 desktop page linked to 1 mobile page and viceversa and discourages the 1-to-multi connections).

What I would like: In my case, I have to add the a single desktop page of desktop site (example www.example.com/category1/), 3 links alternate media tag,( one for iphone.example.mobi, one for android.example.mobi and one for winphone.example.mobi). Furthemore, I have to add a canonical tag in every corresponding mobile page of the 3 mobile site version, a canonical tag pointing to my desktop page ( www.example.com/category1/).

Now my worries are: having a single desktop page with 3 different link alternate tags pointing to 3 different mobile websites (one each), is something or not aligned to the google seo mobile guideline? If not, How should I configure my desktop website and my 3 mobile web applications(iphone, android, winphone) in order to follow the Google requirements for Separate urls apllication?

Thanks,

Massimiliano