Even if you put the power supply in the garage that still doesnt help the fact that the cables are on the other side of the house and now you have to get the cables from the rooms into the garage. As a principal of A company I tell my techs if the job exceeds the 125' not including the run from the room dont do it, its not worth the back charge.
This is CABL.com posting #327555. Tiny Link: cabl.co/mbxnj