Third hand tool:
https://www.amazon.com/Third-Hand-Br.../dp/B0787T5KWD Makes it easier to position/secure the pads
Fourth hand tool:
https://www.amazon.com/IceToolz-Four...dp/B0028N57KK/ I set the brake cable length to put the straddle cable carrier (I don't use link wires, hate 'em) where I want it with the adjuster on the cable hanger screwed out one turn and then use the straddle cable length to position the pads where I want them using the 4th hand tool, then tighten the clamp bolt.. It is a tougher job if you have a fixed-length straddle cable like your 960s, you need to set the pad spacing with the brake cable length.
If you want toe-in (I don't bother) put a rubber band around the rear of the brake pad.
Edit: Probably leave the third hand holding the pads to the rim, secure everything and take off the third hand. The slack in the system will likely get you close.