What is the best way to handle multiple user containers in AD?

Let's supose that My AD has the following structure:

I know how to handle the sync between IDV and one of this containers
(users1, for example), but what is the best solution for synchronise all
users, that are placed in the 3 containers?

- can I use more than 1 AD driver? In this case, does I need more that
one RL? (I just have one domain)
- is it possible to add more than one value in the drv.user.container
global variable? In this case the AD driver could "watch" the 3
containers to catch the changings?

Thanks in advance for your help,

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