You know the problem that I have with rapid fire 'stand at a spot and throw multiple putters' putting practice that I know we've all done a thousand times?
My problem is that its not methodical of how you would putt in an actual round, where you can't get yourself into a groove, only get one try and have to deal with the consequences. I mean, its fine for getting your form corrected, and your routine down, but at some point, you have to apply the routine in a game situation, or something akin to one.
So my advice at the very least is after each putt, reset your feet, or move around to a different spot and reset there. That sort of thing has to be incorporated into your routine, so when you're in a situation where that putt counts, it feels like more of the same, and not something different.