I'm using something similar to these on my Warco copy in the new workshop **LINK** which allow for the uneven concrete floor.
Beware, the Myford is a bit top heavy, with a tendency towards the rear. I've only used adjustable feet in the short term, as I'm not sure where the lathe will finally be sited when its bigger cousin arrives.
In the other workshop in Sheffield, my original genuine Myford is rawlbolted to the floor with appropriate shims.
My Dore Westbury mill is on an angle iron cabinet, with a couple of further horizontal lengths of angle iron at floor level. These carry 4 heavy duty castors, with another set of these adjustable feet outboard of them. It means I can move the mill round, and then wind down the feet for stability.
Bill