I got a 15 watt Intel NUC for free as a business discard. It has an NVMe, 16GB DDR4, and a spinny 1TB SATA drive for backup. My ISP hasn't gone down or made me change addresses in years, but I'm waiting on that day so I can have Copilot write me a script to automatically update my DNS settings in Cloudflare (with DDOS protection) every 5 minutes via cron so I don't have to explore the world of DDNS again.
OTOH, if you have to deal with double NAT, good luck with that hot garbage.