The only negative thoughts for dog flea collars (not familiar with those for cats) is if I remember correctly, one needs to stretch the collar to activate the chemical, before placing on a dog or cutting up to place in your material tubs.
I use the 31 qt Rubbermaid plastic tubs that are about 27" x 16" x 7".
I purchase them at Wally World.
They stack one on top of the other. Course with labels on the front of each one when searching for something it is always in the bottom one or I have forgotten to up date the label as to contents.
I find the No Pest Strips are most cost effective where the Dog flea collars are more costly.

Denny