I may be able to share my experience here since I went through multiple TN1s. You'll satisfy the citizenship requirements but will have difficulty proving sign

I may be able to share my experience here since I went through multiple TN1s. You'll satisfy the citizenship requirements but will have difficulty proving significant ties to Canada if you don't have a bank account, car, home or family still in Canada. Typically speaking you'd have some of these ties if you were a resident of Canada but it doesn't really follow as a hard requirement. As long as you satisfy the border officer that you have the intent to return home to Canada after finishing your contract, you will most likely receive a TN1. It becomes easier if you're a current resident.