Yes, it's much better with the cable attached on a top plate.
I wanted to keep all the original throttle control and governor setup intact on my predator and it wouldn't work any other way for me.
I tried both attachment points on the predator and my cable had too much resistance keeping it from returning back to idle. It didn't snap back like it should and that was even with a heavier return spring attached.
The mechanism operated smoothly by hand but attaching the cable made it stick. I had a new cable so I knew it wasn't snagged and there were no loose strands on it. The stop/hold washer was removed when I first pulled the engine out of the box so that wasn't an issue. It just wouldn't work unless the cable was aimed straight at the engine from the front.
Mounting it on a top plate made the throttle work correctly. A lined cable would be the only other way to go.