You can make brackets from shelf rack and bend it for holding bottom of router & with small z bracket for holding top router against falling over.
Here's picture of my router on wall with lan ports.
I'm looking for a new AX router that can get giga internet broadband as is via fiber with media converter to get full giga speed.
As currently my RT-AC68u router which is 9 yrs old as still running, but only getting up to 700 mbps speed,
Without router, just connect to media converter (GPON) I...