Ordinary hack squats can be hit or a miss for some lifters. In my case, after a double knee surgery, they're a huge miss. Enter landmine hack squats, where the foot-angle alone makes a world of difference for gimpy-kneed lifters.
Instead of having to endure the compressive forces imposed by having your feet on a platform that's exactly perpendicular to the direction of force (as you do with any conventional hack squat), the landmine hack gives the ankles a more open angle, and that means happier knees.
This creates a feeling similar to squatting with a Smith machine, without the confines of a completely fixed path. Having the weight on a fulcrum also allows you to make minor lateral adjustments to find the perfect groove.
Turning around allows you to find the perfect "lean" (and right foot position) to get a great pump.