What
Saint_RNG said is spot on. Unless you render with stock Genesis characters, you'll never have a canned pose that works "out of the box" - there will always be minor adjustments you have to do.
As for your OP... that's a relatively simple pose and you should be able to do it yourself in a few minutes. Honestly, learning how to pose yourself and to get fast at it is one of the core skills with DAZ, IMO.
These two poses from one of my projects are good examples. I couldn't find any base poses that did what I wanted (and I have literally over a thousand poses in my DAZ library). So I had to start fresh and pose them myself. A year ago and I would have freaked out... but lately, I just buckle down and concentrate and can usually whip something up in 20 minutes of fiddling around.
EDIT: I lied.. that bottom one was using the base pose from Z in Love. Of course, still had to adjust the hands, fingers, arms, legs, etc...
EDIT 2: You can also use parts of canned poses. Doing a CTRL-double-click on a pose brings up the Pose Preset Load Options dialogue, where you can change the nodes and propagation to apply that pose only on the bones you selected. You can also use this dialogue to reverse or mirror the pose any character is already in
Don't fall into the trap of thinking the poses you see being sold are natural. Most of them (IMO) are terrible and totally not realistic looking. More like how models look on stage when they have to exaggerate everything to be seen from far away.
Your best pose resource is your own two eyes. Look at other people. Heck.. even call up some images on Google and try and model your poses to what you see. When I took art classes in high school, this was why we did live model classes.
Finally, make sure you save whatever custom poses you made! (as a Pose Preset) The files are tiny and you can save a lot of time when you want to use the same pose again sometime.
