In case you have a robot cleaner to help you do the floor cleaning, I would suggest you consider the first two units. They are wall mount shelves. You have no concern that your robot helper is too high and cannot reach that area underneath the furniture.
Alternatively, you may consider these free-standing stands. They are easy to move from an area to another place in a house in case you would like to makeover your room or change decor theme in the future.
The third one features antique design whereby the last twos are suitable for modern decor. I personally will pick the white color shelves as it looks so elegant and suitable to hold some books which are items that I always want to be easy access.
Living Room Wall Mount Corner Shelves
Wall Mount Corner Rack for Living Room
Free Standing Corner Rack for Living Room
Living Room 5 Tiers Ladder Corner Stand
White Corner Rack for Living Room