It's not "dangerous" to go, even below 10% if you know the distance to a supercharger and know it is in range.
Only caveat is, if the temperature is low and the battery is not very warm, then i would not go below 15%, my wife has one time been in a situation where she was 5 miles from home, the SoC was 11% and the car suddenly refused to go above 50 on the motorway with a posted speed of 70. (She was, but a mile from the end of the motorway anyway, so not a huge deal)
This was a miserable -5c day and the battery was probably not very warm, so a bit of an extreme situation, she might have been better off just doing a bit of battery heating, i bet the car would not have done this if the battery was a bit warmer, even if she would have had a few % less on the SoC