It might not be suitable based on your frame design, but I’ve been successful in preventing any chain jump using the kit-included materials by mounting the motors and chain guide in the manner seen in this link:
The ‘chain guide’ is just loose enough to allow the plastic (which i trimmed to length) to spin freely. The angle maintained by the chain to the sprocket is tight enough to force the chain onto the sprocket at no higher than 225 degrees (ie: SXSW, or ~7 o’clock). it acts like a chain tensioner andalignment guide immediately prior to the sprocket.