The Aigner's do not require precision drilling, since you bolt through the cast iron table, not into it, so no tapping is required. As Rod said, it's no big deal. I just mock up the mounting lip and mark the spots with a sharpie, then start a pilot hole and then the real hole. Takes maybe 15 mins for both holes. Because you bolt through, there is plenty of room for fine adjustment before you tighten the lip down. Roller stands are another option but I like the Aigners for the fact that you can just stick them on the wall when you are done and also, you can daisy chain them and get as much infeed or outfeed support as you need: 3', 6', 9', whatever you want. We had Aigner lips mounted on every machine in the shop back in the day: Shapers, bandsaws, etc.
Erik