They total 25L, they will fit fine on front or back.

I think only a pretty small laptop (12" screen or less) would fit. Folders would be fine if you don't mind them getting crumpled up. That would happen in most any pannier (not sure if it would happen more in a small pannier you roll down onto them, or a large pannier they have room to bounce around in)

I do have a pair of ortlieb frontrollers but I don't use them for day-in-day-out commuting. The daily panniers I use are closer to the size of the backrollers and they comfortably fit a computer and all the papework I ever need on one side, and all my clothes on the other side (shoes stay at the office).