Larger scale operations remote management tools?

Im working on setting up a remote 1MW container farm and wanted to ask some informaation.
Regarding firmware, there are options like Vnish, Braiins, HiveOS and others. Which would be preferred for remote management/monitoring?
Also for remote monitoring/maintenance Foreman was recommended and im wondering what your opinion is?
This is for a somewhat larger setup of nearly 300 ASIC machines.