As can be seen in the following 2 pics, I have my 650 set down directly on the bench. But then I load sitting, so a strong mount would mean I'd have to have the bench much lower to use it.
Whatever you use, make sure it's a really solid bench, preferably bolted to the wall or floor and of hefty construction.
This one is lag bolted to the wall, it doesn't even wiggle under stress from loading.