I do tape tha backing to the table. I smooth it, but do not pull it tight.
I make a pocket in the overhangs and put curtain rods or yardsticks in the " pockets". This puts just enough tension on the backing to minimize wrinkling/bunching up - but not enough to distort the fabric with too much pulling.
My table is 96 x 38 inches and DH made pedastals to raise it six inches.