I'm installing a floor with 1/2" engineered hardwood. This is the stuff that's basically tongue and groove plywood with a small layer of nice finished hardwood as the top layer. I've purchased a floor nailer to do the job. Unfortunately, the flooring staples always seem to be going too deep. The one exception was too shallow and at an air pressure well below what the tool specifies as the minimum.
Ultimately, I'm not sure I'm actually using the right stuff to secure the floor. The manufacturer was not specific with their instructions.
This is a cross-section of the flooring I'm installing. With the angles on the edge, there isn't much except the tongue for the stable to grab in to anyway. Going deep enough to avoid blocking the next piece at the top seems like it will always end up splintering the plywood.