Few things to consider:
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@shakedko I find connectivity to the sites and out of band management to be the biggest challenges right now, when you talk globally. Also VPN is going to be a lot of overhead unless you have good connectivity.
@DSSRyan Yes it is. I would be happy to see which solutions are available out there.
However, how would you approach the other questions assuming that you know that every night you would be able to access these devices?