React Aria exposing state through the className is super handy. Here we’re using the placement returned to define a Tailwind CSS variable which we can then use in Motion to define its animation direction. View sandbox example here.

<TooltipTrigger isOpen={open} onOpenChange={setOpen}>
  <Button>Trigger</Button>
  <AnimatePresence>
    {open ? (
      <MotionTooltip
        className={({ placement }) =>
          cx({
            "[--y:4px]": placement === "top",
            "[--y:-4px]": placement === "bottom",
          })
        }
        offset={6}
        initial={{ opacity: 0, y: "var(--y)" }}
        animate={{ opacity: 1, y: 0 }}
      >
        Content
      </MotionTooltip>
    ) : null}
  </AnimatePresence>
</TooltipTrigger>