

May or may not be applicable to your case, but often applications need additional configuration to work with a reverse proxy. Usually setting from what IPs it will accept forward headers from (your reverse proxy) and what the original requested host was (externally requested domain, eg: yourservice.yourdomain.com)
If your new setup has resulted in changes to either of those things, the issue might be a now-incorrect config of your apps behind the reverse proxy.
I’d thicken the bottom, and then have the interface have some pegs/holes to fit together like a puzzle. If you’re printing in that orientation the pegs should be unlikely to shear off. Then, lots of super glue and sand it down. As others have said, a lip underneath the interface would give you more surface for super glue as well.
Because it’s going in your fridge, there will be inevitable spills that need cleaning. So I’d want to minimize the seam and complexity on the interior of the container.