Best admin panel for client hosting

Can anyone recommend a very good and modern admin panel which gives me all possible technical features (e.g. nginx caching, redis object caching, VPS via DigitalOcean, Git, SSH, root control, API's, automations, etc) but on the other hand offers my non-technical clients a separated, user friendly interface which does not confuse them?

I am quite good at setting up root servers from scratch on my own via SSH and Bash / Command Line but I am considering now to offer to my web development clients ( = WordPress / WooCommerce) also an all inclusive managed hosting at more or less low rates (~ 50€/$ per month) and need a tool which helps me to automate or "outsource" as much config work as possible to be profitable. But again it must not limit me (if necessary I want to be able to adjust anything I want / need via SSH and Command Line) and must offer a separated, easy to use interface for administration of single projects for end-users.

Summing up I need:

• Nginx
• Nginx Caching
• Redis / Memcached Object Caching
• VPS integration (DigitalOcean, Vultr, Linode etc)
• DNS Integrations
• Ideally some WordPress specific features
• Modern Interface (shouldn't look like a SAP app or based on an unmodified Bootstrap template but rather like the DigitalOcean interface)
• Separated super user friendly Interface for non-technical end users (my clients) where they can edit project based information and get basic hosting admin tools (file manager, phpmyadmin or similar etc)
• full control over everything for me (at least through SSH / Bash without conflicting with the admin panel)

Hope it's not too broad and that there are some freelancing full stack devs here who have some experience with (more or less) automated VPS hosting for multiple clients.