Three-point perspective grid, A4
Two horizon points plus a third above or below, on A4, for views that look sharply up or down.
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The third point makes verticals converge
In one and two-point perspective, vertical lines stay vertical. Three-point adds a vanishing point above or below the scene so verticals converge too. That is what you want for a tall building seen from the pavement, where the sides visibly lean inward as they rise, or for looking down on a street from height. Used on an ordinary eye-level scene it produces an obvious distortion.
Up or down decides the mood
A third point above the horizon gives a worm eye view: the subject towers, the viewer is small. Below gives a bird eye view: the viewer looks down, and the subject is diminished. These are strong effects and worth choosing deliberately rather than drifting into. Comics and storyboards use them constantly for exactly that reason.
Keep the third point far away
Placing the third vanishing point close to the subject exaggerates the convergence sharply, and the result reads as a fisheye lens rather than as height. Unless that is the effect you want, keep it well off the page. This grid places it outside the sheet and gives you the rays, which is the practical reason to print one rather than construct it with pins and thread.
Printing it accurately
This only measures correctly if your printer doesn't rescale the page. In the print dialog set Scale: 100%, not "Fit to page" or "Shrink oversized pages". If you're not sure it worked, print the calibration page, measure the ruler on it with a real ruler, and it will tell you exactly what your printer is doing to the page.