This is a simple corner bracket that I made for supporting a glass top on a living room table.  There is only one hole with an adjustable mounting slot on one face.  The other face is solid so it can fit against whatever is on the top of your table.  In my case, it is a tinted glass table top.  I made mine out of ABS, but could easily be don in PLA, PLA+. etc.  I have included print files PLA.  They take around 40 min to print 4 of these brackets.