By "6 point" I mean the character itself has 6 "arms", instead of the typical 5. For my taste, it makes the glyph feel more balanced.
There is this repo: https://github.com/hbin/top-programming-fonts . Unfortunately, I'm not familiar with the legality of obtaining Menlo without OS X/macOS. It is a variation on Bitstream Vera Sans, which is AFAIK Open Source, but I am completely ignorant when it comes to how licenses apply to fonts (as opposed to code).
As for SF Mono, that seems to be impossible to obtain even if* you have macOS and an Apple Developer account (only the UI fonts are available for download). I managed to dig them out of the Xcode application bundle and install them as system-wide fonts, but was greeted with a very scary warning stating that installing these fonts could destabilize my entire system (so far my OS is still running, though)...YMMV.
When you say "6 point" do you mean it's bigger than usual?
Is there a place to obtain SF Mono without an Apple Developer account if you don't happen to have a macOS installation handy?