Is there a preferred way to typeset the dimensions of physical volumes? [closed]

Question

I was wondering if there is a preferred way to typeset the size of 3-dimensional volumes with a specific unit in a scientific paper. For instance, let's say I want to describe the dimensions of a volume that is 1.88 mm by 1.88 mm by 8 mm; I have seen the following alternatives in the literature (I give my examples using the units package, but the specific package is irrelevant to the question):

$\unit[1.88]{mm} \times \unit[1.88]{mm} \times \unit[8]{mm}$
$\unit[1.88 \times 1.88 \times 8]{mm^3}$
$\unit[1.88 \times 1.88 \times 8]{mm}$

The first two options seem reasonable, although I seem to find the second option most often in literature. Option three seems off to me, although I've seen it in some papers. Is there a best practice from a typography point of view, or is it a matter of taste?