Hi @Pugmiester
We faced almost same situation, and we were able to create a small guide for the users to deploy the MXs (HA pair too), get similar devices and you should be able to do it yourself, try to be in their shoes, here are my very high level points
1- First make sure the cabinet/rack is able to accommodate the devices and has enough power sockets
2- Second make sure the Internet Modems have enough Ethernet ports and can supply DHCP IP
3- Create a small Diagram of the actual devices using visio, like this one, with the cabling details
4- Your staff should identify the devices for you by Serial number, so you understand what you are doing when configuring them remotely, you can even prepare the config before the devices even gets online
5- For the setup page, just take that part from this documentation, (it worked for us): https://documentation.meraki.com/MX/Installation_Guides/MX64_Installation_Guide