I agree with Elizabeth, succulents don't mind a little neglect. Full sun, a well drained media and pots that breathe. I do not over pot my succulents. It is the only way to keep them smaller longer. I have both cacti and succulents without thorns. My cats are indoors but I doubt a cat would make a bed in cacti anyway. Shelving is a good idea, but mine are outdoors so I just need a place with good sun and out of range of the sprinklers but still accessible with a garden hose.
A drill with a ceramic bit and a soldering iron I find very useful for putting extra holes in pots. Especially if you want to grow succulents in a recycled container or teacup. I don't like plastic pots, but some of my plants are in them so I use the soldering iron to put more holes in the pot. I also do the same for plastic pots that my orchids are in.