I don't know about cloud stuff much to be honest, if I would do it today, Linux server would also PXE booting Windows hosts (well samba servers are also PXE booted), that are cheap Mini PC's, I like having everything on premise, dual cheap servers + pfsense router (used would do it) will easily support 100+ hosts, with offsite full backup to rsync.net, I can see how samba servers can be in closest data center, instead of on premise.