Here in Ohio these types of Christmas tree stands are popular. They consist of three (3) steel rebar legs with a center steel spike through a water reservoir. When you purchase the tree, the tree seller will drill a deep hole into the middle of the tree. The spike in the stand fits neatly into the hole in the tree for a secure fit.

How to keep the rebar legs from scratchingour newly refinished floors?

I found the answer in the plumbing section of my local hardware store: 1/2 inch water pipe insulation and zip ties.