Subframe connectors for a driver/cruiser, necessary to weld to floor?

To answer the qu3stion posed..... no
My opinion only. Op specified CRUISER. I don't believe floor welding is necessary for a cruiser.
Mine are not welded to the floor, as such. They ARE welded to an outrigger to the rocker, and to the rollbar. A bit more serious than a cruiser however.