Can I create a global newsletter signup block and reuse it throughout the site?

I'm trying to setup Zapier integration to capture email signups and send them over to my email service provider (Sendlane). When trying to setup a Zap, it grabs the unique ID of the signup form. This means that only one form can be connected to a Zap. So if I want to create a blog with 50 posts, and I want to have a newsletter signup form in each post, that's 50 Zaps. I want to be able to create a global signup block that I can reuse throughout the site.

The one option I found was to put it in the footer, but that doesn't work for two reasons. One, it's so far down that no one will ever see it. I want the signup form to be closer to the top. Second, it's on every single page, so it's in places I don't want it to be.

I've been trying to hack it somehow with embeds and galleries and such, but nothing is working. Has anyone else figured this out? I need to have a single newsletter block or signup form with a single ID that I can put in other places around the site as I see fit.

Place it in the footer but hide it with CSS. Then add a Code Block wherever you want it to appear, using JavaScript to pull in the hidden Signup form.

I also need this for both Newsletter Blocks and Contact Forms.

Do you know where I can find the CSS?