

I am hosting a high speed relay right now, and have been for 4+ years, on my home address. I am not getting attacked beyond the usual drivebys that I’d get hit with regardless because I host other outward-facing things.
You do look suspicious to large social media sites, but besides those: I’ve never been blocked from somewhere due to my relay.
Any of those can host a relay, the question is what you expect the throughput to be. I don’t expect the Zero W to survive 5 sustained Mbps, but the 4B and the ThinkPad should easily eat 20 sustained Mbps.