The inside step would be the best location, just inside the stringer. I would recomend a bronze thru hull pick-up secured to a bronze seacock. A good water strainer / filter is also a good idea to prevent debris from getting into the pumps. Make sure you seal the tru hull good with 5200. Also taking in consideration where your trim tabs, trailer / lift bunks meet the hull!
Shurflo makes a great washdown blaster pump
The 800GPH Bait Sentry pump for the live well will keep those baits all day.
Notice the thru hull placement in the below picture on my 23'.
