My stand has 8 mounting holes so I used used 8 rubber mounts. There was too much deflection for my liking so I replaced the inside 4 with solid steel mounts that I made & kept the outside 4 rubber. The outside 4 are mainly just used to prevent skids.
In my experience rubber mounts won't prevent bed twist, I still have to level using the mounts. Rubber mounts will settle in time so after leveling & allowing time to settle level should be checked again.
With that said most rubber mounts have a load range & the proper range mounts should be used for the weight of machine or they may not settle sufficiently. I use Mason mounts on my lathe, mill, & air compressor but I mainly use them on the mill & AC cause the floor is not very level where they sit.
On some older lathes, some have only 1 leg on the tailstock side to help prevent bed twist, never seen any modern import lathes built like that though.