Hi Adam
Is it going to sit on a concrete floor?
The instructions you posted say to remove about 1 in of the concrete floor, so that sounds like the concrete pad is expected to be mounted on a CONCRETE floor, the pad is just to reinforce an existing concrete floor. I would be concerned about mounting it on a wooden floor.
In the early 70s approx. my family had a Frigidaire automatic that always had balancing problems and used to jump around the laundry. It was not a bolt down machine, it had suspension but it was forever going badly off balance and would take many, many tries to get it balanced and spinning. Dad, who was a carpenter, made a 4 inch concrete slab and sat it on the wooden floor, and put the Frigidaire washer on top. Sitting on top, not bolted. The machine still jumped around, the concrete slab moved on the floor, and the washing machine would sometimes jump off the slab and it was a mongrel job to get it back up again. The machine was taken away and fully reconditioned at one stage, but the balancing problem continued after it returned. It was never any better and was eventually replaced by a GE. Point is, a concrete slab is no panacaea. The upward forces generated on spin in a front loader are HUGE and if it has no suspension, it will have to be VERY securely mounted. Either mount direct to a concrete floor, or mount on a heavy slab that is BOLTED directly to heavy floor joists. And keep alert for damage to the building from vibration.
I have a Turner Sapphire bolt down washing machine, a top loader so it doesn't generate the uplift that a front loader does, and I have never bolted it down. I have only tried using it a couple of times and if it is even a little out of balance, I can't hold it down, it jumps despite me trying to hold it in place.