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It can be, but you'd need to make the hardware yourself.
If you look at this photo
you can see the rear boss they refer to in their literaturerear through-eyelet...attach a flat fender or add an additional/alternate rack strut to the >crown of your fork
You can also get adapter for adding mid-blade eyelets, Tubus do good ones like this. If you don't mind me asking, if you're speccing a touring tandem why not get mid-blade eyelets on the fork?
Yes, it's for the tandem. I don't think the Surly Nice can be mounted to the caliper eyelet, can it?