While it is true that AGM's are maintenance free... they are also more than twice as expensive as regular wet cell batteries. There is NO NEED to spend that much money just to get "no maintenance" IF you don't boondock as you say.
There is a different type of maintenance free battery that is a WET CELL that has special valving and an extra water reservoir...usually sold as a dual purpose or starting battery. You would want the dual purpose type. There is no such thing as a true deep cycle maintenance free wet cell battery.
There are many good reasons to spend the extra money for AGM's if you have other specific needs...but if you don't boondock...you can be just fine with wet cell maintenance free.
Here's an example of wet cell maintenance free batts...https://www.batteriesplus.com/batter...p-27m/sli27mdp