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I don’t know for sure but I bet the 30 days to play and or the fretting hand toolbox will have tips regarding position.
I think it was a recent “Acoustic Tuesday” podcast that talked about fretting hand tips.
What I have found is that over time (1) my hand has become more flexible and made it easier to fret things that were very uncomfortable at the start and (2) I gradually gravitated to a position that works for me.
I emphasized the words “Over Time” because @Bill_Brown advice to just do what is comfortable can be tough in the beginning, because you don’t even know yet what is comfortable for you. To that I say just trust the process and keep playing.
Some of the things above, I had learned from videos but it took a while to internalize it and for my body to learn to do it.
Two things regarding guitar position. If the neck is level ie: horizontal, it makes it a little harder to curl your fingers around the neck to fret the strings. Holding the neck at an upward angle, as much as 45* can make fretting easier. Also the position of the guitar left to right in your lap can make a difference. I find a strap helps tremendously in helping me hold the guitar in a position that is easy for me to play.