We would like each of our consultants to have a child version of our main site (e.g. their own website). The majority of the content will come from the main site but each cloned site will have a couple of articles that each consultant can change and personalise.

However, we also want each consultant to have their own version of vtiger CRM that will be opened in a wrapper within the site.

My question is: where is the best place to put vtiger so that it is created along with each site and also autocreate a new database for each CRM - could I execute a script at the same time (I know I'm asking a lot here - but what the heck)?

Sorry but your description is not clear or inconsistent.

You mentioned that you want to have the CRM runing in a wrapper within the site and after you ask how to auto create a CRM for each website.

If you are using a wrapper, this mean that the CRM is present in a single website and that all wrapper call this website to have access to the common CRM. So that they don't have a duplicated CRM.

Concerning the other question relative to create website with shared articles, you can get inspired of "Article Sharing" video
tutorial.jms2win.com/joomla/multisite-12...ingforjms/index.html
or the video 0.d that present an overview.
www.jms2win.com/en/tutorial#jms12x-0d

The idea is to have a website that contain the CRM (ie crmsite) and another website with the articles and content (ie. contentsite) that contain a wrapper on your CRM website. So that you can replicate the "contentsite" to build the children website for the consultant and that is ready to use.