I also hate floor vents so I moved them to better locations like on an adjacent wall or under the sofa, one is now blowing up from the electric fireplace another discharges into a cavity under a cabinet. I did the work before I refloored the old girl so the patches in the floor would not be seen.
My dislike was stepping on the metal grate in my bare feet besides it just doesnt seem like the proper way to build things, I did all of that without much trouble so I'm sure the factory could have made that design change.