Blocking floor vents with furniture stops your HVAC from working right. Vents are designed to pull air from outside walls, let it rise and fall to condition the space. Leave space around all vents so air can flow freely.
What I have seen and what you need to be careful of is when the vents are in the floor, do not put the furniture over the vents. Do not put a couch smack dab against the wall at the return. That will cause a problem. So back up a little bit, give it a little bit of room, and don't put furniture and things like that over the floor grills. Because it's trying to if it's on the floor, it's supposed to be on an outside wall. So it's trying to condition that wall. So the air is blowing up. I mean, if you were like doing a smoke test and you can actually see it, the air would be going up, hitting the ceiling, and then falling back down to condition the wall. So if you have furniture or something in the way, obviously that can happen. So it's going to affect that room, that situation.
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