Tor operator here.

If you don’t have a second IP for your relay, don’t host at home. You will have CAPTCHAs everywhere, many sites will block you and your ISP will eventually contact you to stop degrading their IP space reputation.

Most website owners don’t discriminate between Tor exits and relays. They subscribe to block-lists that include all known Tor IP addresses. Major online services will make your browsing experience really shitty and once you’re a “known Tor IP” it will take months to remove that reputation.