I didn't really like anything I've seen, and just wanted a basic feet for my Ikea Lack.  I modeled this up in Fusion360.  It's a square a bit wider than the Lack's legs so it indexes.  The hole in the bottom is wide so you can get more than a screwdriver in it.  Modeled for 41mm drywall screws.  

Also, when you print it, please flip the print.  I had a brainfart when I was modeling it and didn't realize that I did it all upside down.