FR3 30DS Maxx Fan Install

[boarf16]

We recently bought a 2014 FR3 30DS. I want to install 3 Maxx Fan Deluxe Fans into the coach, but conveniently this coach is not pre-wired for vent fans. I do not have any aluminum sheets to look behind, only styrofoam and more Styrofoam. I think my options are:

1. Tap into the power of the light that is just outside of the shower then run 3 wires to each of the 3 locations.
- Concerns are the amps might be too high to run 3 fans?
--It seems like the max amps the fans would draw is 4.7 amps at start up = 14.1 amps (assuming I started all three at the same time) plus the 2x 921 bulbs (which I will be replacing with LED shortly) (.1 amps x 2 bulbs) so I should be good on a 15 amp breaker...correct?

2. Somehow find a way to run wires from the house battery, up through the corner in the closet, then through the roof to center and then down the coach to each fan location.

Has anyone done a full install on the FR3 30DS?

Thanks!