This was my thought process when I bought mine. The rears stay super cool now. They took longer to bed in than the front, lol. I debated leaving the dust shields on and after leaving them on I don't think I needed to remove them with how cool they run.
Start with painters tape fo sho. I still use painters tape when I decide to run Time Trials. I wash the car before the event and clean the magnet before applying. I stick the magnets together when not in use. Mine were $25 done at the track.