Your suggestion works in some cases but not others, due to the “One feature, one element” principle. Sometimes I do map multiple POIs, such as for this engineer’s office that has enough desks and employees that I could imagine each one serving a different sewerage district, mapped as separate POIs right next to it.
On the other hand, I can’t stress enough that multiple professionals often share the same office without a distinct name for the office. Two dentists have a shared practice at this single office at unit #3, incidentally signposted in two languages. Their partnership has no publicly visible name of its own, unlike the shared practice next door in unit #4:
I’ve also seen situations where a single desk doubles as multiple distinct businesses. These businesses may have different names and websites, but in the real world, they might exist only as different tabs in a browser window on the computer on a desk in an office.
It’s not just professionals: some retail businesses also combine brands in a manner that makes a multi-POI representation purely arbitrary. This is really just a single restaurant that happens to serve items from two brands:
I can’t tell you whether a slash or dash or space is technically the most appropriate delimiter. But if I order a Taco Bell burrito with a side of KFC mashed potatoes from the restaurant’s single counter, my credit card statement might well say KFCTACOBELL on it. 