Clivias do better when they can run along the surface more than dig into a pot. Dappled light under trees where they'll get leaf-litter over their roots, too. If they are potted, they can do well under Camellias or other broadleaf evergreens.

They can be amazingly hard to extract from pots after a few years...and they sulk a bit, too.

I think I'd make the move just before rain was forecast - and a spell of cooler weather, so they can settle in over the winter.