Hello Steve, personally, I think that bolting to a concrete floor is the best, taking care no to induce any twist in the bed.
Having said that, my own Boxford lathe is not bolted down because there is a waterproof membrane over the concrete and I don't like to damage it.
Lathes tend to be top heavy and liable to tip although I think that this is less likely when the lathe is on a manufactures cabinet.
Brian