With regards to showing the full model title under the models...
Maximum model title length appears to be 50 characters.
As the store window is widened and narrowed the columns range from
2 to 3 to 4, the displayed title characters range as follows on my laptop:
(note that displayed characters are also followed by ellipses)
2 columns
mode 1: 10 - 15 characters
mode 2: 15 - 26 characters
3 columns:
mode 1: 16 - 23 characters
4 columns:
mode 1: 16 - 18 characters
So if you want a better chance of the full model title being displayed it's
probably best to limit it to 10 characters in length.
If the full model title were to be displayed the worst case situation
would require 5 lines under the shop preview image, although
if the ellipses were dropped maybe it could be done with 4 lines.
ETA: Another option might be to have 1 column of display in order to be able to display more relevant information for each model, in addition to a longer model title. Upon cursory examination it looks like in this mode Ebay has a minimum title length capacity of 64 characters and Amazon comes in with at least 80 characters.
Is the idea behind putting more models on a page, potentially 48, related to the assumption that more eyeballs falling on more products results in more sales? One could theorize that the display of more complete descriptive information could also drive increased sales because it would prevent shoppers from having to needlessly click down into models and back out again to determine those specifics. That's wasted shopping time. There must be studies for this type of thing by now, or consultants that could help recommend the preferred approaches.