I am fussy. I demand Intermatic® Some I put a thirteen hundred watt load on for ten minutes or so, daily and they have lasted years. I used an Intermatic for my revised 80 amp battery charger and the quality of the Intermatic is so much better than a standard charger wind-up timer it is a joke. I HATE electronic switched (SCR) timers. They don't time so well after they emit the inevitable puff of smoke.
Also Intermatic makes an electronic multi-button selectable timer 2, 5, 10, 15 minute plus on and off timer with a MECHANICAL relay. Good for 15 amps.
I use a utility knife to cut an outline hole in the wall. Fit the timer, then use the cover plate. I've seen OAK plates for coax that would be pretty but I cannot remember where.