Is this the good plugin to map domain and subdomain?

Hello,

I have my main domain that work perfectly and i added a subdomain to have some blogs for my readers. The subdomain is carnet.1max2peche.com

My multisite is perfectly working with users that create a blog, but instead having user.carnet.1max2peche.com i would like to have an adress on my primary domain : user.1max2peche.com

I want this automatically configured because i can have a lot of readers and i don't want to create an A entry on my DNS for each new blog, so i need to use wildcards DNS.

But for the moment, i can't have what i want, i purchased the plugin "Domain Mapping" and i would like to know if it can resolve my problem, and how configure it?

Thanks a lot.
Regards
Geoffray