What is the correct positioning for the following poses

I’m 6’4 and have read numerous explanations for how far apart my feet should be apart in Utthita Parsvakonasana and Utthita Trikonasana. Many explanations suggest 3.5 to 4 feet. But surely there shoud be some relationship between how tall you are and distancing. I have also seen a suggestion of having your feet under your wrists if you extend your arms out and using this distance That said I am also wondering if you should have a wider stance in Utthita Parsvakonasana than Utthita Trikonasana. And should your feet be at a right angle or 45 degrees?