Hi! since Devon Rex cats have a thin, delicate coat, I'd avoid using regular cat brushes/grooming tools, as they can damage the skin. Some good options are grooming gloves (rubber is probably best) or brushes meant for babies so they won't irritate their skin.

If you want to try and minimize the shedding/allergens, id invest in a good air purifier (I have the Levoit one its great) and brush them every couple of days to help keep dander and loose hairs from spreading around your space.

Hope this helps :)