Stack or use multiple notification toasts

I’ve seen it many times before where you’re on a website and you get a notification which comes in the form of a toast, if you perform the same action another toast will appear and it will push the previous toast slightly up the screen.

I’m wondering, would it be better to have multiple toasts displaying or whether it would be better that if another one got triggered, remove the previous one as soon as possible and enter the new one?