op do you have a link
https://www.aliexpress.com/item/1005004263195778.html?spm=a2g0o.order_list.0.0.7d6c18028WYfAMIf caps backs each other, like if 6 out of 10 is working and 4 are bad, the riser still works, then more is better. I think it acts as electrical noise filters.
The caps are there to smooth the voltage and are generally connected directly across the 12 volt line to ground. If a cap goes bad, it's not uncommon for it to short which would be disastrous, though a modern power supply might shutdown fast enough to avoid serious damage.
I'm not really keen on all this LED bling and wonder how many extra watts it will consume but the voltage and temperature displays might be useful. They are pretty cheap so I'm going to test them out and if I find out anything remarkable will update this thread.