I prefer one hole in the center of the slat and use a divided sleeve that is open in the center. For years I have used a 1/4" thick wooden slat with a hole drilled in the center to go over a nail to hang an art quilt on the wall. If that piece was entered in an art show, I attached eye-hooks to the ends of the slats and attached the wire (twisting like on a picture frame).
Recently I discovered 2 inch faux wood blinds. They are economical, sturdy, and can be cut shorter or or glued together to add strength and extra length. I bought one 23" x 64" blind and disassembled it, leaving me with lots of neat white, thin slats with two little slit openings. I can run wire through the slits. To secure the knot in the wire, I add some Liquid Nails or E6000.
|front, facing the sleeve opening|
|back, facing back of quilt|
|front, two slats glued to get proper length|
|back, two slats glued, using drilled holes for wire|
|ready to hang in gallery with slat; remove slat for pipe & drape|