Peter, the most reasonable expectation is some solid wood some thin rubber then the hammer. The rubber allows a little movement so that the lag screws don't come out as fast. I have done this with a 50 LG and it walks around so I have also lagged it into the slab. it is better.
No heavier than a 25 is, a friend has simply caulked the floor of his shop and set the hammer (same as yours) directly to the slab. It doesn't walk or bounce or crack. It is also well tuned and stays that way.
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