I think you’re thinking of ZeroTier as more advanced and complex than it is. At the base level you need to be thinking, “Is this something I can be doing with a physical network and router”, not “Can ZeroTier do X”.
ZeroTier is a virtual network cable & switch. Quite literally. It operates at Layer 2 of the OSI networking stack. Sure we’re building cool things on top of that, but at a base level, it’s just a virtual ethernet cable & switch between devices. If you can do it with a physical network, you can do it with ZeroTier.
That being said, let’s consider your question in terms of a physical wire (or wireless access point) and switch network. Could you assign a single route to multiple hosts in a physical network? The answer is No. The answer is the same with ZeroTier, because at its most basic level, it’s just a virtual network switch.
That being said, things like OSPF, BP, et al, also work over ZeroTier. Like I said. ZeroTier is Layer 2 of the OSI stack. Anything that works on Layer 2 of a physical network also works over ZeroTier. Your imagination is the limit as long as it works on a traditional networking stack!