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https://surlybikes.com/info_hole/spew/spew_bottom_bracket_sizin
Most single speed specific hubs, like the Surly New hubs, put your cog into a nice position outwards from the center of the dropouts (approximately 53.5mm for MTB, 42.5mm for track).
sbbohr
bjf
oheyitsd
The 120mm is 43.5mm for freewheel and 42mm for fixed. The 130mm and 135mm are both 53.5mm for freewheel or 52mm for fixed, no? I don’t know if you have hubs in hand but that’s what surly’s documentation describes as far as I understand.
Edit: I may admit I may be wrong. Surly’s documentation says there are two chainlines for their hubs. Forums seem to show they’re more.