It's good you're not trying to use the other type on the street. If adjusted to where the "instant center" is very far out, the stresses on the housing can be enormous, a good pothole can tear a bracket off the housing.
On your setup if the bars run downward from the chassis to the axle, it increases anti-squat but also causes the rr axle to steer into corners with body roll which is really bad for high-speed stability. Having the bars angle up from the chassis to axle, stability is better but it's going to squat more at launch. As is being said, for your use the best compromise is probably straight level.
It would be worth doing enough research on, that you're dead-certain by the time you get the welder out.