As I recall, the User Guide states that up to 50 DNA samples will fit... Yes, they all have to be willing to undergo the same program - and it is good that there be some separation - like being in separate tape, so they don't touch.
There are ways... I often use a single piece of paper and just tape the individual samples to it, each labeled with an initial representing the individual it belongs to... This way, I can remove any one as needed, but still have plenty of room for more.
I think it is more to exemplify the point that you can stuff the poor little remote to the gills with samples and each get the same good from it...
It doesn't have to be a large piece of any one sample though, as DNA is microscopic.
For more details, please check the link: