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Gday Steve
Troy pretty much nailed it.
Levelling grout can be cement/polymer based, but mostly it is some form of pourable epoxy, and can be messy to use.
For small baseplates, a dry pack grout is the simplest and cheapest.
Specialised cement based "grouts" ( vs bog std mortars ) use ingredients that effectively prevent shrinkage as it sets, and allow it to get good strength in thin layers.
That said, i wouldnt use levelling nuts under the plate, as if there is any later shrinkage etc, you cant retension. A single shim/packer in the middle allows good grout penetration, and you can still retension later if required.
Andrew
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