I wouldn't meaasure it by the distance per side you need to watch for .. I'd look at it from the perspective of what lens type you are using it on.

eg. if you were using these rings on a 200mm lens with a 77mm filter thread, then because the angle of view is so narrow .. you could easily stack four or so small graduations of adapters and get away without vignetting!
But if your lens was say a 10mm focal length, the the FOV is going to be something like 100° or so .. so even one adapter could cause mechanical vignetting.

So what is more important is what type of lens is it(are they) rather than just the filter ring diameter.

But in saying that tho, I dare say that the 72mm filtered lens should be fine with just the one adapter even if it's an UWA type.(unless it's a 180° fisheye lens! )
The idea of the one type of filter adapter per lens is the best way to go tho