This seems like an exercise in "what if".
I understand that that needs to be done, but the general rule should be "how to prevent".
The storage area has to be thought out in advance. I understand space and expense is an issue. I assume cost is a driver in going from barrels to totes?
What is the real cost in lost product and clean up costs if a tote spews all over the place vs. staying with much easier to handle barrels?
Spill containment pallets are fine, well and good, but they assume that they are large enough to contain the volume of the tote, and are large enough to contain the four foot stream of HFCS as posted above.
Call me a simple man, but the best prevention is proper training and fear of deity of your choice.
People handling/moving/staging these containers MUST be aware of the consequences of failure. Yes, I know, accidents happen, but in my experience, damage to ingredient containers are mostly due to lack of attention or lack of care.
You can't apparently spend the money to build a storage area that will mitigate the result of a spill, so maybe some intensive training on material handling, only allowing competent people to move these items, and maybe purchase of a couple of high capacity floor scrubbers/vacuums might be a good idea.