nothing wrong with overkill, and this is good advice! to OP: if you can QT every animal in separate rooms, then go for it! if you're like me and have only a few spots where you can tightly control the husbandry, it's not the end of the world but you will need to pay closer attention to any behavior changes in the animals.
sidenote: if i bought different species at the same show, i'd QT them separately.