Power pack for ho ez app system

[LWH1948]

New comer to model trains. I have an office about 11' x 13' and I want to run a shelf around edge of room just above flat screen tv, to run ho ez app train. About 45-48' of track, so what would be the best power pack just to supply power to ez track? Want to hide all controls and wiring behind tv if possible, and only use I phone or IPad to operate. Looking for suggestions.