Drainage near tank is good..no need to lay such a long hose, short hose will do..
Tap wise not much use..the important is how n where to mix n hold the water for wc..its best if got place to have a tank for mixing salt n water (like AM behind the shop like that)..big tank require more water, thus a lot of reefers need to mix a few times as no big container..otherwise, can engage ppl to wc at a cost..