That supply should be able to handle a single S9 but you definitely want to check the gauge of the wire going to the 20amp outlet.  If you are pulling 1300-1400W continuously though it it should probably be 10gauge if possible.  Based on this article (https://www.kitguru.net/components/power-supplies/zardon/%ef%bb%bfevga-supernova-p2-1600-supply-review/3/) you can pull about 1600W though the 12V rail on that power supply.  Don't be surprised if the PCI-E wires and/or power cord gets warm.

Good luck and I hope it all works for you.  BTW, if you have two 110V lines available, then you could easily do a 220V lines (like we do in the US) since it is likely there is two phase.  Nevertheless I understand the hesitancy to go that unknown route especially if you are renting.  Again, good luck and be safe!