So I'm looking to install a flat bottom vessel sink. I still need to have the countertop made and wasn't sure what size hole to have them drill. Laying the vessel on a flat surface I can see about 3/8 gap from the counter to the bottom of the drain hole. Do I install the pop up drain and Tighten the nut on the underside of the counter? Or do I cut a larger hole and just mount the pop up only on the vessel? Just wondering because if the drain was to leak with the first option, it would just pool between the sink and countertop. Where as with option two the bottom rubber would seal any leaks coming from the top seal. Thanks