Since it is a 1050, it probably will not give out much hit. Getting a single fan should do you just fine. Now if you have sufficent cooling in your case, a single fan would be perfect. But if you don't have suffiicent cooling, then you may want to consider the dual fan.
For the record, I have a mid tower case with a single fan GTX 1060. And it stays below 60 C even on full load. I suppose my Noctua fans helps as well