Pyinfra to manage and install software (I'm fed up with custom DSLs, pyinfra is pure python)
If you’re using Ubuntu it’s Pretty great. It does support custom Linux and windows images but the feature set isn’t as good for storage and network config etc and that doesn’t get as much focus as first party Ubuntu deployment. So if your primary OS is something else there may be better tailored solutions.
More generally there is a class of “metal” management solutions you can look at similar like Foreman and OpenStack Ironic that usually have some variation of PXE boot install. Hopefully some others can chime in with good examples or recommendations for those.
May help to share what your primary OS/Distro is and others you need to do.
I go to the data centre from time to time, mostly taking junior engineers for a sightseeing trip to show them how "the cloud" actually looks :-)
If you need colocation in London I can put you in touch.