The answer depends on whether you have Creator or Enterprise anchors. With enterprise anchors, you can use an unlimited amount of tags.
With a Creator kit, you can also easily track multiple tags at the same time. One factor to keep in mind though, is that in a Creator system, more tags means a lower update rate per tag. In the Creator kits’ wireless TWR protocol, the update rate of max 60 Hz is divided between all tags equally. For Creator setups we thus advise the use of maximum 5 tags for high update rate applications and 10 tags for low update rate applications.