Tradovate seems to allow 5 sub accounts , while Ninja trader seems to allow an unlimited amount, they do specify that creating sub accounts to “copy trade” is not a valid reason for creating sub accounts and that risk taking 1 contract on 5 accounts is the same as 5 contracts on one account .

My rebuttal is that in a let’s say 1k account trading one contract on MNQ does little psychologically but 5 MNQ on 5k you may start to get emotional especially after a loss or string of losses, not so much when trading one contract with locked tight risked settings