Organic email capture only works if a site is getting meaningful traffic. You’ll only capture 1% of traffic. If you’re only getting low hundreds of visitors per month, you’re better off putting effort into generating traffic.
Lead Magnets - The best offers degrade the user experience, which can impact search traffic. Find a balance. Lead magnets have a better capture rate than straightforward newsletter signups. 2x better is normal. With the right content offer, these can be very high-quality subscribers. Registration Walls - Search traffic damage. Use sparingly.
In most cases, when presenting a subscription form, it’s best to ask for an email address alone, then enrich it with First/Last name and other info later. You can automate this with Zapier and Clay.