WP MU handles out of the box one "layer" like:
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I need to setup a Wordpress MU network in sub-domains with multiple "layers" such as:
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Eventually need to handle a couple of hundred of WP installs, what I can do on my own after the "network" has been setup. Please make your bid including 25 WP installs. I have a host in my mind but recommendation for host is welcome.
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I have exactly done this when i was working in a reputed MNC. The corporate site i maintained had more than 20000 blogs, and 60000 user base. All these maintained using single MU code base.
If you want any specific details, i can share with you over PMB.
Kindly check your PMB. We have 8+ years of experienced. I will give you the best quality of work & satisfies you & completed this job within given time frame. I design & developed the whole package according to you.