Mark , I was looking at your rail anvil , I have a vague re collection from my apprenticeship days of 50 yrs ago that even small anvils should sit on the grain end of a block of apple or ash wood or some old conveyor belting .
Done so that the resonance of the strike comes back into what your striking .. it helps stop bruising of the metal , same applied to the bigger anvils .
I've only ever seen one mounted on a metal base & that was a home made base which didn't last five minutes till some of the welds came apart ..