Maybe this is a well-known method, in case not wanted to share how to view multiple models UVs all at the same time., because selecting multiple objects UV tags currently only displays one UV tag at a time.
Group models inside a Connect object and add a material texture tag to the connect object set to UV. Select the Connect objects Material Tag and all the grouped models UVs can be seen at the same time.
This has helped me speed up UV atlases layout for devices like Oculus Quest, hope it helps others.
Love the new R21 UV transform tool, thank you Maxon!