I wonder if there was a collision of super heavy black holes, would we feel the gravitational waves by ourselves
I'm no physicist, but, the earth is massive so is influenced a lot more by external gravity than the specs on its surface that are people. Take the moon, it's a huge object hovering over the planet (effectively, it's slow moving, the earth rotates underneath it), its gravity pulling on seawater and causing ebb and flow. But we cannot feel its gravitational effects ourselves.
One could imagine though some configuration of many pairs of black holes, orbiting at different frequencies to interfere with one another and produce a sharp beat, perhaps with other mass configured to act as focusing lenses. Still almost certainly wouldn't exist in nature but a cool potential scifi concept.