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You could also use the method most common in the UK - a cat flap and next door's garden.

Yeah, our CatGenie used to service two cats, with the second one only occasionally using it as he vastly preferred being an indoor/outdoor cat and doing his business outside. That ended last Christmas day when he tried to race a car across a snowy street to get to the "next door's garden".

That solution might not work out well for everyone.

There does seem to be a US/UK split as to whether cats are indoor or outdoor animals. I would say 90%+ of UK cats are allowed outside. I think the figure is lower in the US.

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