Most consumer routers don’t offer this functionality out of the box, likely because manufacturers don’t consider it essential for most users. There’s no major technical reason it couldn’t be built in though. You can already set up DNS sinkholing with OPNsense or pfSense if you don’t mind running and managing your own router.

You can kinda see the monacle in the third picture.

My last home I put the server in the closet with my heat pump water heater. They pretty much balanced each other out.

Slightly better “this happened weeks ago but we’re just now getting around to updating everyone”.