We currently have a single template that always places the message component at the top of the page. We need alternative templates that place the message elsewhere for pages that want to prioritize other things. Alternatively, we could rethink how we're displaying messages. I've avoided pop-up type displays because they potentially get in the way of what you're doing. I've avoided inserting an element into the DOM because it causes the rest of the page elements to jump. That leaves giving it a reserved place, but when real-estate is a premium (as with the site editor), that seems suboptimal.
We currently have a single template that always places the message component at the top of the page. We need alternative templates that place the message elsewhere for pages that want to prioritize other things. Alternatively, we could rethink how we're displaying messages. I've avoided pop-up type displays because they potentially get in the way of what you're doing. I've avoided inserting an element into the DOM because it causes the rest of the page elements to jump. That leaves giving it a reserved place, but when real-estate is a premium (as with the site editor), that seems suboptimal.