I got lazy

[Halfhidden]

Just a quicky.
I did have several servers that were geographically separated and obviously on different public ips, now I need to bring those servers in to one location and have now a non natted public ip range.
I've set that up with the Draytek Vigor as alias ips and am able to open ports on each public ip according to my needs.
OK I got lazy and set up Nginx Proxy Manager to handle the reverse proxies on one server that hosts various dockers and VM's as subdomains. But I'm finding NPM very restricted when it comes down to other services like mail... well anything other than 80 and 443.
So my setup is as follows and my question is what is still the best way to go:
Three servers on separate public ip's with at least one server running multiple dockers with various services all using sub domains from a single domain. Example phone.mydomain running phone services. mail.mydomain running mail services and so on.

What am I trying to achieve: I'd like to achieve a gateway firewall and some sort of reverse proxy. I've read in the past that HAProxy and Pfsense is the way to go but I'm asking is that still the best approach? As a bonus I would be grateful is anyone knew of a tutorial that covers the type of installation I'm doing, but understand that this isn't a typical install and I may have to climb a mountain to achieve it. I understand the value of knowledge, versus pain and gain ;)