Those are perfectly acceptable and normal for getting a tq wrench on a nut when you cannot use a socket. Care must be taken (if you care about accurate torque) to keep the open end of the wrench at a 90 degree angle to the head of a torque wrench, If it is at 0 degrees, as in the top picture, you are increasing the moment arm of the wrench. If it is at 180 degrees, you are decreasing the moment arm (see how the open part of the wrench is forward of the pivot ie:extension?)
Sets like these (except by snap-on) is what I used when turning wrenches on aircraft...
https://www.amazon.com/Stanley-Proto-J5100-Torque-Adapter/dp/B001HWEAAG
