For larger sous vide cooks, I bought an inexpensive cooler with the cup holder indentions in the lid. I drilled out one cup holder with a hole saw the size of my Anova. I figured out the minimum water level and marked the inside so I know how much to fill it up to. The insulation helps with minimizing heat loss and overworking the equipment. Some people get bigger coolers and run two machines, one on either end.
The main thing is that you don’t create a dam preventing the water to circulate. There are adjustable wire racks to keep pouches organized in the water and keeps the bags off the bottom. You can use those to help ensure circulation.
