I'm planning to use a similar size pull (not bin though) and I plan to use two per drawer on my 36 inch drawer stacks. The next biggest drawer in my space with be 30 inches wide and I plan to use just one on it, partly because it will be a shallow drawer underneath a speed oven in a not very prominent place in my kitchen.

I think at some point I searched and found previous threads on this topic with pictures which really helped me decide.

On my 36" drawers I used one 6" pull. Two would have worked also. Anything larger, or smaller pulls, I would use 2 pulls.

Are your drawers slab or paneled? With a 4" bin pull I would definitely use 2 on a 36" drawer and probably 1 on the others.

The 30 and 36" are slab the 24" are top slab other two shaker style. Leaning towards two for the 36" drawers.

I think it depends a lot on the detailing. For my 24" and 30" slab drawers, I decided that a single standard-sized pull really didn't look right. I ended up going with 13" pulls on those. I think it's very helpful to visually mock up the various options (either with cardboard and the actual pulls, or with image software).

I need symmetry so I had faux drawer fronts (with pulls) put on my cabs. All my drawer pulls are 4". My widest drawer stack is 33" and near end of reno, I rebelled and stepped out of my comfort zone. The top drawer which holds the wax papers, aluminum foils, baggies, etc only have one center pull. The other deeper drawers have two pulls. Surprisingly, I still like it.

Edit: corrected size