Under bed fuel tank recommendations

[Missyblue]

Hey again so we made some progress and removed our in cab fuel tank. I have been researching and Trying to figure out the best route for moving it. What I am hoping for is photos/advice/opinions on the matter of what works well and why my priorities/preferences in a perfect world are
1. No/very little frame modification
2. Needs to be adaptable to fuel injection
3. And I'm liking the idea of filling behind the license plate? I have seen some say they did it but cant find my saved post maybe that tank requires more mods to frame.
4. Trying to find a not $400 gas tank haha unless it's way worth it and installs itself 😉
I'm just hoping for advice on what does and doesn't work well I know mustang seems popular but theres so many others I read about just curious.

Any install photos would be great also.

Thank You thank you