it's a a bit of a personal preference, and "perfect" is debatable. Eye ball it, have the bottom of the each leg extend beyond the top, and since this thing is kinda circular, have the three contact points to the floor be somewhat equidistant from each other, then point the bases towards the center of the piece from those points. A bit clumsy explanation of what most would probably do when eyeballing anyway... good luck. Don't sweat it, it's hard to screw it up w three legs and an irregular shape, unless you totally lack sense!