Creating "fat" Termimal multiboot server LTSP

I have 150 mining servers. They all have own ssd drives, and EthOS distribution based on Ununtu. Now I want to crate centralized server without ssd. All machines will connect by wlan and take the image of OS from central server. I have read about LTSP open source project that gives you posibility to make this. But this package are for ubuntu, but OS on servers must be other. How can I make them to boot OS that are not installed on my central server?