Yes, basically all the individual steering box protectors that I've seen don't attach to any bumpers. They attach through the use of stock bolts and 1 that you drill into the round crossmember. That bolt is a self tapping bolt. Supposedly, if you use a torsion style sway bar that bolt still clears. The other mounting points are the steering box bolts and the lower side bumper bolt in the frame.
Now, there may be some out there that a bumper mfr will add to his bumper design as an additional item, but then it will only work on that bumper.