Having recently setup an UnRaid server I used a walkthrough video on setting up SSL certs for them through Cloudflare and Google Domains. Was already using their DNS (1.1.1.1) and had an account so made that it an easy decision, then Google decided Domains would be sold off so I fully migrated to Cloudflare. I find the free tier to have more things included than I even understand and it does everything I need.