Nothing looks better at the customer's home when bringing the outside cable into a utilitly room or closet if you can mount the PoE brick on the wall without the need for zip ties.
Something wherein the brick can snap into.
There are other POE injectors that have mounting screw holes, have integrated surge suppression, and have metal ethernet casings so you can run a shielded cable up to the SM to leech static from the SM and prevent static discharges that tend to kill the WAN ports of customers' routers.
If you do a search for "Injector of power over ethernet," you'll get a slew of them and should be able to track down a supplier.