You might try something like these, or hiding a bunch of rubber/neoprene casters in the bottom of the two “feet”. Otherwise, for hardwood floors, thick felt is pretty well the gold standard for anything permanently attached to furniture.

You could also try securing PTFE along the bottoms of the feet, then when moving the table, you lay down a wool blanket or rug, and keep the rug stationary while moving the table across it. You could also flip the table over and do roughly the same thing.