If the pump is driven with a direct shaft, the only mount you want is something to stop the pump from spinning, and let the pump float on the shaft.
If you want the pump mounted solid, there needs to be a flex coupling.
A coupling can only allow so much misalignment though. If there is any movement between the engine and mount, best to go with the floating mount. At the same time, the floating mount needs a shaft that runs true with minimal runout.