I’m impressed with that.
I had a Nuc 9 extreme with a 10gb SFP card in it.
It averaged 69w. The Mac Mini I replaced it with uses just under 5w.
A Mini is possible the worst bang for buck. Also, the horror that that is Desktop Docker can’t be over emphasised. I know there are better ways of using Docker on a Mac, but having got something working I can’t face rebuilding it.
But when starting from scratch, it might be better to get an older Mini that is supported by Asahi and run Linux on it.
My home router is a Lenovo ThinkCentre Tiny with a Core i3-8100T with a dual 10Gbit SFP in it (1x DAC, 1x 10GBase-T) and it idles at 14W, routing 10gbit full bore, 24W. I got it for $80
I also have some Fujitsu office machine I picked up for $50 as my "I need to run some random task on a physical linux box" machine with an i5-7500 and it idles at 15W