I really liked the idea of the source dock but it was too big for my phone and I didn't have a right angle cable. But it has a Tinkercad link! I haven't ever used Tinkercad but I'm passably familiar with CAD programs and it seemed pretty straightforward so I rolled up my sleeves and dug in.
Unfortunately I quickly found that Tinkercad and I don't speak the same language. I couldn't find a way to measure the distance from a part to a specific point. It would give me measurements but only ones that it deemed necessary which it turns out weren't the ones I wanted. After a bit of searching on the internet, finding developer posts that said "yeah, we don't do that", and printing a failed version that had the wrong dimensions I finally gave up and re-created it in Fusion 360. Since then I've noticed that there's a "Take Your Designs Further with Autodesk" section under Export that just opens it in Fusion 360. (sigh)
This dock is designed specifically around a standard iPhone cable. You insert the cable vertically through the back of the dock, twist it 90 degrees, and then push it back in to lock it in place. That keeps it from rotating or being pushed back through the dock. You do have to fasten it down to keep it from pulling forward (tape, superglue, etc.) but this should angle your phone quickly on to the connector with a minimum of fuss.