A ruler, a pencil, a spirit level or laser for precision, a drill, screws and ankles adapted to the support... and voila!
Measure the size of the frames and note the distance between the border of the frame and the hook on the back.
Organize the position of the frames on the floor. When it suits you, measure the gaps between the edges.
Put the drawing of your organization on the wall in pencil. Use a spirit level for a straight path.
Spot precisely the location of the hooks on each frame. Trace in pencil the piercing point.
Drill with a drill adapted to the support (diameter indicated in principle on the packing of the dowels, here 8? Mm).
Push the dowel (in grid, for plasterboard) into the hole with a hammer, then screw the hook.
Put the frame on the hook to screw, perfect for this use. It screws more easily with a screwdriver.
Adjust the position of the tables. Remember to use X hooks if handling a drill puts you off.