Considering what we've learned and that they seem to be family oriented just as we are, I'd say there are many of them and the numbers could very well be much more than we realize.
Yes, they can visit you at home (inside) and they're not using the door to enter. Each visit now pepperonis continually disappear from the fridge at the cottage. We count them and the bag dwindles as the night progresses.
It's funny, last night I was typing something to someone and had written the words "other worldly". No sooner had I finished that, I heard something drop in the kitchen behind me. It made no sense. My cat laying behind me on the couch perked his head up looking over that way wondering what that was. I've had an instance at home with an incredible grunt going off in my head. It was NOT my thought. There's an extremely distinct difference when a sasquatch does it.