Naming convention for implant locations EXPANDED

I have referred to having my payment conversion in position #4.5 , I retract that statement

In reality
It would be a #4 in Amals indexing
or
it would be a #3.5 in Satur9s

Mine is ON the bone rather than between the bones.

BUT
I just watched Amals video explaining the difference between the two positions at the bottom of this post
So now under Amals indexing, mine would be #3.5

Also in the Thenar space, it is sometimes possible to fit 2 implants into position #0
so would that make the one closest to position #1 actually #0.5 or would that .5 equal being on the bone of the first finger being that of the index and not the thumb.
OR
would it be better to have #n.5 on the bone making the double implant in the thenar #0 and #00

which in medical terms 00 is larger than 0
however in shotgun pellet sizes 00 buck is larger but with fewer pellets than 0