I have set up a multisite using mapped domains and so

I have set up a multisite using mapped domains and so in total have 4 sites.
The first site is purely a landing page that links to 3 other locations. The home site is lifeandsoul.com.au
then there is:
broomelifeandsoul.com.au
derbylifeandsoul.com.au
karrathalifeandsoul.com.au

These sites are not live as yet, the home site still links to the old site but you can see the others.
I have purchased a copy of Ultimate Facebook Plug-in but do not want to install it on the lifeandsoul.com.au as this site has no pages as explained above.
I am in a bit of a muddle now. Where do I go from here? I cant see the dashboard on any of the other sites, even though it is network activated.
Do I have to purchase the plug-in another 2 times? and how do I install on the other 3 sites?
Thanks