With the wingbar edge 9595 you have two lengths of bars. 89.6 cm and 97.6 cm.
The Thule WingBar Edge can be pushed inwards by a maximum of 12 cm. But this does not mean that is the case for your vehicle. It's something that can't be predicted. So based on that we will take the minimum lenght which is 77.6 cm.
If you don't place your bikes staggered than the maximum number of Thule 591 ProRide's you can mount is 2.
When you place 3 ProRide's staggered they take up 65 cm. But that is really placing it tight next to each other, but regardless it leaves you 11cm to play with.
Hope it helps.