We recommend against bolting a machine down, unless the surface it is bolted to is more rigid and flatter/truer than the machine structure — the best option here is to put the machine on a platform which is attached to pulleys and cables which allow lifting it up to the ceiling out of the way.
That said, I did put one of my SO3 (Standard size) machines on a cart:
since then I have shuffled things around a bit and the current setup uses an aluminum threaded baseplate bolted to a sheet of MDF w/ a layer of foam in-between.