I have my Unifi Controller running within Docker on a Synology NAS. It is simple to set up, for example by following the instructions here. Getting certificates for https with the Synology UI is straightforward. Functionality to obtain (for example) LetsEncrypt certificates is readily available in the Control Panel under Security/Certificates. But how can one transfer those certificates to the UniFi Controller running in Docker? Here is how it worked for me:
Most workstations and NAS come with multiple Ethernet ports nowadays, so one would assume that port bonding with 802.3ad is a popular and easy to configure option. Port bonding can double the bandwidth while maintaining a single IP address, at least if you have multiple connection active at the same time. Of course, it is not so simple in practice. The main issue is how the devices split the data across the two links.