A black hole is a single point. The “funnel” doesn’t go “down” like a drain…it goes inward towards the center of that point from all directions at once.

That funnel idea is just a graphical representation that they use to illustrate the idea. But, in reality, it doesn’t make sense to represent it that way. The effect is similar, but you have to try and imagine it happening in all directions at the same time…like a spherical funnel…which is difficult to visualise.