For most it’s easier to just buy Bitcoin.
And for me personally I went with Braiins Mini miners. 1-1.4 TH/s for 40-60 W.
Discussion
This has nothing to do with stacking though so that doesn't make sense really.
Bitaxe ~1.2TH @ 15watts it says.
Also braiins mini miners are not pushing Open Source forward I don't think?
Bitaxe.org
Support OS development so we can break the Chinese manufctr cartel & pool cartels all at once!