I don't know about fanless, especially with an i5 as opposed to n-something.

But not all those minis are the same. G4 (intel 8th gen) and G5 (intel 9th gen) HPs are horrendous. The fan makes an extremely aggravating noise, and I haven't found a way to fix it. Bonus points for both the fan and heatsink having custom mounts, so even if you wanted to have an ugly but quiet machine by slapping a standard cooler, you couldn't.

G6 versions (intel 10th gen) seem to have fixed this, and they're mostly inaudible on a desk, unless you're compiling something for half an hour.