As timun say, yes. Probably a bit more costly having them run to the floor but so worth it. Ceiling vents in a basement are common as it's easy just to tie into the existing duct work but getting them to the floor will make your basement temperature much more consistent and comfortable.
Cold air return in the ceiling is going to do nothing but pick up air that has already been warmed. Get them down on the floor where they will do the most good. Proper air circulation is most important in in the basement IMO.
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