Best way to manage 100-200 Raspberry Pi?

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Hey r/sysadmin,

I am in the process of configuring a fleet of Raspberry Pi's and i am not sure how i want to remotely manage them. The Raspberry Pi's will run CentOS 7 and will be rolled out to multiple different customers and therefore all be in different networks out of my control.

I have no experience managing that many boxes, could you point me in the right direction? The OS does not have to be CentOS, it just seemed like the most stable OS to use. The Raspberry Pi's will run a Node.js app that will send data from connected devices that we sell to our Webserver so customers can view it.

Thanks in advance! ๐Ÿ™‚