Yes, Definitely an overhang and self healing mat.
These two are ten years old and work well, I wouldn't change them.
4 x 12,
4" overhang.
3.5" x 1/4" angle, 96" in between legs
2' square legs, 2" angle for everything else.
3/4" particle board tops (Two 25" x 145" counter top stock - cheap)
One...