You can’t. When my ISP switched me to CGNAT, I spent days upgrading everything to IPv6, only to discover that gmail didn’t even support it! (Mail Server to mail server, not the web app) I gave up, asked my ISP IPv4 back and, fortunately, got back a new IPv4. But I fear the day that option will disappear…
This is aimed at desktop use. I guess it would be hard to mount if it was smaller than mini-ITX spec and/or wouldn't mount firmly on some/many desktop cases.