I have no clue what you mean about "round plugs"
Is that the part that plugs into the MACHINE?
Some of the machines are 'hard-wired' meaning the wiring is directly wired to the motor
Some of the machines have 'plugs' that fit somewhere on the machine and a wall plug that goes into a wall socket
A round wall plug with flat blades is ok
other than that I have no idea what you mean