There are lots on the market. One thing I learned early on is that suction cups are brutal. They work for a while but soon deform and stop working. I always liked the Koralia powerheads as they use a magnet from the outside to hold things in place. I use one for my PWC
tote. And depending on your budget you can't go wrong with a Ecotech Vortech pump. You can get multiples of them but usually one will do the trick. Held on by magnet and actually driven by magnet as well...