@Bill It occurs to me that you might want to reduce the transmission of vibration from the machine to the fabric of the house. We had that problem with DS's study desk, which I made out of a sheet of softwood taken out of the kitchen when we upgraded it, and four screw-on legs from B&Q. Behind the desk we installed some of that shelving system where the verticals are screwed to the walls and the shelf brackets clip in, but we had them already so didn't buy new and they were a bit too long, meaning the desk banged against them when he was hammering away on the keyboard or if he moved stuff around. We solved the problem by using those felt pads you put on the legs of wooden furniture to stop it marking hard floors, which are available for pennies in all sorts of places.
Maybe putting them on the feet of your desk and, if the furniture vibrates when you're machining at speed, on the sides of the worksurface where it abuts the walls? I wouldn't put them on the feet of the machine itself as it will 'walk'!