I have a set of computer/work bifocals (monitor/closer) and a set of regular bifocals (reading/driving). Both of them are progressives with no lines. . It's not a matter of my neck position, it's a matter of headaches from my eyes straining, if I don't wear the computer glasses. It's gotten so I can't/won't/don't use the computer with my regular bifocals.

For neck strain, what helped me the most was to set my monitor correctly based on OSHA recommendations for viewing.