85% of contact work, with or without helmets and shoulder pads, can be a variation of this. Specifically for near foot, near shoulder tackles. There's still a lot of other aspects to tackling you have to work: the near-pec angle, the profile tackle, different entry angles, footwork, etc. You don't need a bunch of gimmicks. Running around cones. Tackle wheels. Rolling around with bags. Straight fundamentals: timing the power step, dropping pad level, creating force into the ground. Takes hundreds of reps, focusing on the right things to build the right tackling habits that show up on game day.