The classic method of biwiring from one set of posts at the amp to two sets at the speaker is to have a pair of cables made up with two runs of wire from one set of spades or bananas) to be a separate wire run to each of the posts of the speakers.
The pros of doing so is the hope that the sound will be better. The cons of doing so are the comment one could buy a 'twice as good' single run of speaker cable and thus ALSO have better sound. (and use a jumper of the same speaker cable)
To use one wire from spade, and one from banana would be OK, but not as correct an impementation.
Either way. (i personally use two runs of 8TC Kimber and biwire)