Tanks can be placed on any side.
Installed Fittings See Photos
Two) 1.5" Female NPT Fitting - fitting is sealed to use remove membrane with razor knife
Two) .5" Female NPT Fitting - fitting is open
We do not offer clean-out ports at this time but there are many options online that allow you to install the needed clean-out port.
****VERIFY IF ITEM IS FOOD SAFE BEFORE PURCHASING****
Example: Dometic Universal Holding Tank Clean-out Kit - we do not sell this item
Example: 8 inch Boat Hatch Cover Deck Plate Hatch,White 8 inch Non Slip Inspection Hatch w/Detachable Cover
https://www.classacustoms.com/Water-Tank-Clean-Out-Port-and-Fittings_b_62.html