No more digging around in Katzengras

I bought this part because I have 2 indoor cats, which of course have a need to eat cat grass. Because I want to have lying around but not always earth or grass seed, because they just-for-fun about digging it again, I have found me this part. The thing fulfills its purpose and is super slippery. What bothers me personally, that's this Catit Senses things visually not are odious, but noticed in the apartment with her Quietschfarben already. I have this grass garden and massage center and I find that it does not enrich the apartment visually ... What I would find great would be if there were even a bigger here because it is simply too small 2 cats and I do not want to have to stand around 2 ugly grass gardens.
Otherwise as I said => it does the job